KR102245267B1 - Signature registration method, signature authentication method and apparatus thereof - Google Patents

Abstract

An input unit for receiving a signature, and a detection unit for detecting a state of the signature registration device while the signature is being input; A storage unit for registering the inputted signature; Disclosed is a signature registration device comprising a control unit for storing information on a state of the detected signature registration device and information on an input signature in a storage unit.

Description

Signature registration method, signature authentication method, and device thereof {SIGNATURE REGISTRATION METHOD, SIGNATURE AUTHENTICATION METHOD AND APPARATUS THEREOF}

The present invention relates to a method of registering a signature for authentication, a method of authenticating a signature by calculating a degree of matching with a registered signature, a signature registration device, and a signature authentication device.

Signatures are being used as a way to check whether a user accessing a digital device is an authorized user. In particular, mobile devices such as mobile phones with touch screens with touch input means, portable media players (PMPs), personal digital assistants (PDAs), portable game consoles, digital cameras, digital camcorders, and e-books are used. Signing is being used as a way to authenticate the intended user. However, since the mobile device is often used while the user is moving or used by hand, the performance of signature recognition is lower than that of a device used in a fixed location. In addition, when a signature is first registered and when an identity authentication is attempted for the use of the device, the state of the device may vary depending on the user's posture and the input data may be different. In this case, the success rate of signature recognition is further reduced. There is a tendency.

The present invention relates to a signature registration device and method using information on a user's posture or device state at the time of signature input, in addition to information on an input signature, and a signature authentication device and method.

The signature registration device according to an embodiment of the present invention includes an input unit for receiving a signature, a detection unit for detecting a state of the signature registration device, a storage unit, information on the state of the detected signature registration device, and the input And a control unit for storing information on a signature in the storage unit, and a state of the signature registration device includes one of a fixed state and a gripped state.

The sensing unit according to an embodiment of the present invention may include a sensor that detects at least one of a tilt and acceleration of the signature registration device.

The controller according to an embodiment of the present invention may determine a state of the signature registration device to which the signature is input as a fixed state when the detected slope of the signature registration device is within a predetermined range.

When the detected acceleration of the signature registration device varies within a predetermined range, the control unit according to an embodiment of the present invention may determine a state of the signature registration device to which the signature is input as a fixed state.

A signature registration method in a signature registration device according to an embodiment of the present invention includes the steps of: receiving a signature; Determining a state of the signature registration device detected using a sensor; Storing information on a state of the signature registration device and information on the inputted signature, wherein the state of the signature registration device includes one of a fixed state and a gripped state.

A signature authentication device according to an embodiment of the present invention includes an input unit for receiving a user's signature, a detection unit for detecting a state of the signature authentication device to which the signature is input, and a pre-registered signature and a state of the signature registration device. A storage unit for storing information, information on the state of the registered signature and the signature registration device previously stored in the storage unit, the signature input through the input unit, and information on the state of the signature authentication device detected by the detection unit And a control unit for authenticating the input signature by using, and a state of the signature registration device includes one of a fixed state and a grip state, and the state of the signature authentication device includes one of a fixed state and a grip state. .

According to an embodiment of the present invention, when the device state in the case of registering the signature and the state of the signature authentication device are different from each other, the control unit is configured for each feature used to calculate a matching degree between the previously registered signature and the input signature. You can change the weight.

The controller according to an embodiment of the present invention may change an authentication success threshold value used for authentication of the input signature when the state of the device when registering the signature and the state of the signature authentication device are different from each other.

The control unit according to an embodiment of the present invention may downwardly change the authentication success threshold used for authentication of the input signature when the device state in the case of registering the signature and the state of the signature authentication device are in the grip state. have.

A signature authentication method in a signature authentication device according to an embodiment of the present invention includes receiving a user's signature, determining a state of the signature authentication device to which the signature is input by a sensor, and registering a signature. And authenticating the input signature using information on a pre-registered signature and device state, and information on the input signature and the state of the signature authentication device, and the device state in the case of registering the signature A includes one of a fixed state and a gripped state, and the state of the signature authentication device includes one of a fixed state and a gripped state.

A signature authentication device according to an embodiment of the present invention includes an input unit that receives a user's signature, a storage unit that stores information on a pre-stored registration signature and user state when registering a signature, and information on a user state from a wearable device. The input signature is performed using the communication unit for receiving, information on the registered signature and the user status stored in the storage unit, the signature input through the input unit, and information on the user status received through the communication unit. It includes a control unit that authenticates.

A signature authentication method in a signature authentication device according to an embodiment of the present invention includes the steps of receiving a user's signature, receiving information about the user's state from a wearable device, and registering a previously stored registration signature when registering a signature. And authenticating the input signature by using the stored user status information and the input signature and the user status information received from the wearable device.

A signature authentication device according to an embodiment of the present invention includes an input unit that receives a user's signature, a detection unit that detects a state of the signature authentication device to which the signature is input, a pre-stored registration signature in case of registering a signature, and a user state. A storage unit that stores information about the device state and information about the device state, a communication unit that receives information about the user state from a wearable device, the registration signature previously stored in the storage unit, information about the user state, and the device state. And a control unit for authenticating the input signature by using information and a signature input through the input unit, information on the user status received through the communication unit, and information on a device status received from the sensing unit.

A signature authentication method in a signature authentication device according to an embodiment of the present invention includes receiving a user's signature, receiving a state of the device detected by a sensor, and receiving information on a user state from a wearable device. Step of, when registering a signature, a pre-stored registration signature, information on a pre-stored user state, information on a pre-stored device state, and information on the inputted signature and the user state received from the wearable device, the device And authenticating the inputted signature by using the information on the state of.

1A is a block diagram illustrating a signature registration apparatus according to an embodiment of the present invention.
1B is a block diagram illustrating a signature authentication apparatus according to an embodiment of the present invention.
2 is a flowchart illustrating a signature registration method according to an embodiment of the present invention.
3A and 3B are diagrams for explaining a state of a signature registration device and/or a signature authentication device according to an embodiment of the present invention.
4 is a flowchart illustrating a signature authentication method according to an embodiment of the present invention.
5 is a flowchart illustrating an embodiment of the present invention and a method of registering and authenticating a related signature.
6 is a diagram for describing an operation between a device and a wearable device related to another embodiment of the present invention.
7 is a block diagram illustrating a device and a wearable device related to another embodiment of the present invention.
8 is a flowchart illustrating a device signature registration and authentication method according to another embodiment of the present invention.
9 is a flowchart illustrating a device signature registration and authentication method according to another embodiment of the present invention.
10 to 13 are diagrams for explaining an example of a device signature registration and authentication method according to another embodiment of the present invention.

The terms used in the present specification will be briefly described, and the present invention will be described in detail.

Terms used in the present invention have selected general terms that are currently widely used as possible while taking functions of the present invention into consideration, but this may vary according to the intention or precedent of a technician working in the field, the emergence of new technologies, and the like. In addition, in certain cases, there are terms arbitrarily selected by the applicant, and in this case, the meaning of the terms will be described in detail in the description of the corresponding invention. Therefore, the terms used in the present invention should be interpreted based on the meaning of the term and the overall contents of the present invention, not a simple name of the term.

When a part of the specification is said to "include" a certain component, it means that other components may be further included rather than excluding other components unless specifically stated to the contrary. In addition, terms such as "... unit" and "... module" described in the specification mean a unit that processes at least one function or operation, which is implemented as hardware or software, or as a combination of hardware and software. Can be.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and similar reference numerals are attached to similar parts throughout the specification.

1A is a block diagram illustrating a signature registration device related to an embodiment of the present invention, and FIG. 1B is a block configuration diagram illustrating a signature authentication device related to an embodiment of the present invention.

The signature registration device and the signature authentication device may be physically implemented as one device, but may be separate devices. In general, a user registers a signature through a device and inputs a signature for authenticating use rights on the same device. In this case, the signature registration device and the signature authentication device are implemented with the same device. In addition, the signature registration device and/or the signature authentication device are mobile devices such as mobile phones, portable media players (PMPs), personal digital assistants (PDAs), portable game consoles, digital cameras, digital camcorders, and e-books. However, the present invention is not limited thereto, and may be a computing device equipped with a processor capable of processing signature registration and authentication.

Referring to FIG. 1A, the signature registration device 100 is a device having a function of initially registering a signature to be used for authentication by a user or changing a signature that is already registered. The signature registration device 100 may include an input unit 110, a registration control unit 120, a detection unit 130, and a storage unit 140.

The input unit 110 is for receiving a signature from a user. The input unit 110 may be implemented by a touch input means, but is not limited thereto, and may be implemented by other input means such as a mouse. When the input unit 110 is implemented by a touch input means, the signature registration device 100 may include a touch screen (not shown). The touch screen (not shown) may include a touch panel for receiving a touch and a display screen for displaying a shortcut icon or a result corresponding to the received touch. The touch panel may include various input methods such as a resistive method, a capacitive method, an ultrasonic method, or an infrared method.

In order to prevent an unauthorized user from accessing or using the device 100, the user may select a signature registration menu on the device 100 and register a signature. The registered signature will be used to authenticate access rights to the signature registration device 100 or the signature authentication device 150 in the future.

The detection unit 130 is for detecting the state of the signature registration device 100 while a signature is being input. The state of the signature registration device 100 is for a condition or situation that affects the user's signature input. For example, when the signature is input, whether the signature registration device 100 is in a fixed state, a moving state, or flat It refers to whether it is on a fixed table, whether it is in the user's hand, or in a shaking state.

The state of the signature registration device 100 may depend on the user's posture at the time of signature input. That is, the state of the signature registration device 100 may vary depending on the attitude of the user handling the signature registration device 100. For example, when a user inputs a signature for registration while placing the signature registration device 100 on a table or fixing the signature registration device 100 without shaking, the signature registration device 100 is in a fixed state. would. In addition, when a user inputs a signature for registration while holding the signature registration device 100 in his hand, the signature registration device 100 will be in a gripped state. For example, when a user registers a signature while moving while holding the signature registration device 100 in his or her hand, the signature registration device 100 may be in a gripped state.

The detector 130 may include at least one of an orientation sensor for detecting a pitch of the signature registration device 100 and a speed sensor for detecting an acceleration. The pitch sensed by the orientation sensor means the orientation of the device 100, that is, the inclination. The orientation sensor can detect a direction (azimuth, or yaw), a pitch, and a roll corresponding to the three-dimensional (for example, x-axis, y-axis, and z-axis) of the device 100. have. The speed sensor is for detecting the degree of movement of the device 100. The speed sensor may detect a degree of movement, for example, a change in speed over time or a change in distance over time. The direction of the device 100 may be calculated using a direction sensor and a speed sensor. In addition, the movement of the device 100 may be calculated using a direction sensor and a speed sensor.

The detection unit 130 for detecting the direction and/or movement of the device 100 may include a proximity sensor, an acceleration sensor, a gyro sensor, or a terrestrial magnetism sensor. I can.

The storage unit 140 may store a signature input by a user. The information on the input signature may include a shape of the signature, a speed of the signature input, and/or a pressure at the time of a sensed input. In addition, information on the state of the signature registration device 100 detected by the detection unit 130 while the signature is being input is also generated by the registration control unit 120 and stored in the storage unit 140. For example, the storage unit 140 may store information on the slope (or pitch) or acceleration of the signature registration device 100. In addition, the storage unit 140 may store information on one of a fixed state and a grip state of the signature registration device 100.

The registration control unit 120 generates information on the state of the device 150 while the signature to be registered is being input by using the information obtained by the detection unit 130, and information on the state of the generated signature registration device. And the inputted signature information is stored in the storage unit 140.

Both the registration control unit 120 of the signature registration device 100 and the authentication control unit 170 of the signature authentication device 150 may be implemented as a processor, and the signature registration device 100 and the signature authentication device 150 When implemented as a device, one control unit including a processor will serve as the registration control unit 120 and the authentication control unit 170, but in this embodiment, the signature registration device 100 shown in Fig. 1A and Fig. 1B Different names are given to distinguish and describe the signature authentication device 150 shown in FIG.

The registration control unit 120 may determine a device state while a signature is being input using at least one of a pitch and an acceleration of the signature registration device 100 sensed by the detection unit 130. For example, the registration control unit 120 uses one of the pitch and acceleration of the signature registration device 100 detected by the detection unit 130 or both the pitch and acceleration to determine the device state while the signature is being input. I can. Examples of the device state may be a fixed state or a grip state.

As shown in Fig. 3A, if the pitch of the device 100 is close to 0 degrees based on the flat table, it is considered that the user is entering a signature while placing the device 100 on a flat table or floor. In this case, the state of the device 100 will be determined as a fixed state.

As shown in FIG. 3B, when the pitch of the device 100 falls within the range of 30 to 45 degrees, which is a predetermined range based on the flat table, the user who enters the signature should hold the device 100 in his hand. It may be considered that a signature is being entered, and in this case, the state of the device 100 will be determined to be a gripped state. It is obvious to those skilled in the art that the range of 30 to 45 degrees is only an example, and that other ranges that serve as a criterion for judgment may be used.

The registration control unit 120 indicates that the signature registration device 100 is in a fixed state while the signature is input when the detected pitch of the signature registration device 100 is within another predetermined range (eg, -5 degrees to 5 degrees). If not, it may be determined that the device 100 is in a gripped state.

The registration control unit 120 may generate posture information of the user, that is, state information of the device 100 by checking the stability of a sensor value output from the speed sensor. When the device 100 is in a fixed state, the sensor value will be input the same or there will be only stable fluctuations while the signature is being input. When the device 100 is in the gripped state, the sensor value will fluctuate from time to time because the device 100 shakes while entering a signature.

The registration control unit 120 fluctuates within a predetermined range (for example, -1.5 = x-axis = 1.5 ㎨, -1.5 = y-axis = 1.5 ㎨, -1.5 = z-axis = 1.5 ㎨). If it is (for example, stable fluctuation), it is determined that the signature registration device 100 is in a fixed state while the signature is being input, and if not (for example, it fluctuates from time to time), the device 100 is considered to be in a gripped state. You can decide. The predetermined range of the acceleration change amount may be displayed including the gravitational acceleration unit (g), such as -0.1g = x-axis = 0.1g. Changes in units can also be applied to the rest of the axes. It will be readily understood by those of ordinary skill in the art that the predetermined range of the acceleration change amount can be changed.

In determining the state of the device 100, both information about the pitch and acceleration of the device 100 may be used. For example, the pitch of the signature registration device 100 placed on a reading desk inclined at a predetermined angle (eg, 20 to 50 degrees) on a flat table is another predetermined range (eg, 10 to 60 degrees) , When the amount of change in the sensor value received from the speed sensor is a stable variation, the registration control unit 120 may determine the signature registration device 100 as a fixed state while the signature is being input. In addition, when the detected pitch of the signature registration device 100 is within a predetermined range (for example, -5 degrees to 5 degrees) and the amount of change in the sensor value received from the speed sensor varies from time to time, the registration control unit 120 While the signature is being input, the signature registration device 100 may be determined in a gripped state.

Referring to FIG. 1B, when a user inputs a signature to be used for authentication, the signature authentication device 150 is a device having a function of determining whether or not authentication is successful by comparing it with a registered signature. The signature authentication device 150 may include an input unit 160, an authentication control unit 170, a detection unit 180, and a storage unit 190.

The input unit 160 is for receiving a signature from a user. In order to use the device 150 in a locked state, the user inputs a signature through the input unit 160. The input unit 160 may be implemented by a touch input means, but is not limited thereto. When the input unit 160 is implemented by a touch input means, the signature authentication device 150 may include a touch screen (not shown). The touch screen (not shown) may include a touch panel for receiving a touch and a display screen for displaying a shortcut icon or a result corresponding to the received touch. The touch panel may include various input methods such as a resistive method, a capacitive method, an ultrasonic method, or an infrared method.

The detection unit 180 is for detecting the state of the signature authentication device 150 while a signature for authentication is input. The state of the signature authentication device 150 affects the accuracy of the signature input by the user. The detection unit 180 may include at least one of an orientation sensor for detecting a pitch of the signature authentication device 150 and a speed sensor for detecting an acceleration. The sensing unit 180 may include a proximity sensor, an acceleration sensor, a gyro sensor, or a terrestrial magnetism sensor.

The storage unit 190 may store a signature registered by a user and information on a device state at the time of signature registration. The information on the input signature may include the shape of the signature, the speed of the signature input, and/or the pressure at the time of the input being sensed. In addition, the information on the signature input for authentication may include the shape of the signature, the speed of the signature input, and/or the pressure at the time of the detected input.

The storage unit 190 may store information on the slope (or pitch) and/or acceleration of the signature authentication device 150. In addition, the storage unit 190 may store information on one of a fixed state and a gripped state of the signature authentication device 150.

The storage unit 190 may store weights for each feature. For example, the storage unit 190 may store a weight for each feature corresponding to a case in which information on the state of the signature authentication device when the signature is input and the information on the state of the device when the signature is registered are the same. In addition, the storage unit 190 may store a weight for each feature that is changed corresponding to a case in which information on the state of the signature authentication device at the time of signature input and the information on the state of the device at the time of signature registration are different.

The storage unit 190 may store an authentication success threshold. For example, the storage unit 190 may store a changed authentication success threshold value corresponding to a case where information on the state of the signature authentication device when the signature is input and information on the state of the device when the signature is registered are different from each other. In addition, the storage unit 190 may store a changed authentication success threshold value corresponding to a case where the information on the state of the signature authentication device when the signature is input and the information on the state of the device when the signature is registered are the same.

The authentication control unit 170 generates state information of the device 150 while a signature is being input by using the information obtained by the detection unit 180. For example, the authentication control unit 170 determines whether the signature authentication device 150 is in a fixed state or a grip state while a signature is being input, using at least one of a pitch and an acceleration of the signature authentication device 150. . The authentication control unit 170 may determine a device state while a signature is being input using one of the pitch and acceleration of the signature authentication device 150 sensed by the detection unit 160, or both the pitch and acceleration. The determination of the state of the signature authentication device 150 may be performed in the same or similar manner as the determination of the state of the signature registration device 100.

If the pitch of the signature authentication device 150 is within a predetermined range, it may be determined that the signature authentication device 150 is in a fixed state while a signature is being input. If the pitch of the signature authentication device 150 is within another predetermined range, it may be determined that the signature authentication device 150 has been in a gripped state.

On the other hand, when the acceleration of the signature authentication device 150 changes within a predetermined range, it may be determined that the signature authentication device 150 has been in a fixed state while the signature is being input, and if not, it may be determined that it has been in a gripped state.

The authentication control unit 170 includes a registration signature stored in the storage unit 190 and information about the device state at the time of signature registration, and the signature inputted through the input unit 160 for authentication and the signature authentication device 150 at the time of inputting the signature. The entered signature can be authenticated using the status information. The authentication control unit 170 compares the registered signature and the input signature to calculate a matching degree, and compares the result of the matching degree calculation with an authentication success threshold to determine whether to authenticate by the input signature. Information on the state of the device at the time of signature registration and information on the state of the signature authentication device 150 upon inputting a signature for authentication may be referred to for calculating the degree of matching and determining whether authentication is successful.

The authentication control unit 170 is used for calculating the authentication success threshold and/or the degree of matching according to the state information of the signature authentication device 150 at the time of signature input and the device state at the time of signature authentication stored in the storage unit 190. You can change the weight for each feature.

If both the device state at the time of signature input and the device state at the time of signature authentication are fixed, the accuracy of the signature input is high at both points. Therefore, the authentication routine using the set value without changing the authentication success threshold or weight for each feature. This will be done.

The authentication control unit 170 compares the information on the state of the signature authentication device 150 at the time of signature input and the information on the state of the device at the time of signature registration stored in the storage unit 190, according to the result of comparing the registered signature. It is possible to change the weight for each feature used to calculate the matching degree of the signature entered for authentication and. Features used to calculate the degree of matching between two signatures may include the shape of the signature, the speed of the signature input, and the pressure at the time of being sensed. Each feature has a weight indicating the importance in calculating the degree of matching. For example, when calculating the degree of conformance, the degree of conformity can be calculated using a reference weight that basically sets the weights of shape, speed, and pressure to 30, 30, and 40, respectively. The weight applied to the calculation of the matching degree may be a relative ratio such as 3:3:4. The sum of weights applied to calculation of the matching degree may be 100. In addition, even when the weights for each feature are respectively changed by the authentication control unit 170, the sum of the weights may be equal to 100.

Consider a case in which a user registers a signature while fixing the registration device 100 on a flat surface, and a case in which the user authenticates the signature while holding the authentication device 150 in his or her hand. If the device state at the time of registration is fixed, but the device state at the time of authentication is in the gripping state, the probability of being changed by the difference between the pressure detected at the time of signature registration and the pressure detected at the time of authentication is high. True Accept Rate (TAR) may decrease. When a signature is registered in a fixed state and a signature is authenticated in a gripped state, if the reference weight is used due to the difference between the pressure detected during signature registration and the pressure detected during signature authentication, the self-authentication rate (TAR) may decrease. The authentication control unit 170 may improve the self-authentication success rate by changing the weight (eg, 30, 30, 40) of each feature to 35, 35, and 30, respectively, to calculate the degree of matching. The weight of each signature feature is one embodiment, and it is common knowledge in the art that the weight of each signature feature can be changed in response to the state of the device 150 (eg, a fixed state or a gripped state). It will be easily understood by those who have.

The authentication control unit 170, based on a result of comparing the information on the state of the signature authentication device 150 at the time of signature input and the information on the state of the device at the time of signature registration, the authentication success threshold used for authenticating the inputted signature You can increase the identity verification rate by changing the method. The authentication success threshold is a reference value for determining whether authentication is successful when the registered signature and the signature input for authentication are similar to each other. For example, if the authentication success threshold is set to 80, and the device state at registration and the device state at authentication are both fixed, suppose that the user's own authentication success rate, that is, the TAR, is 97%.

On the other hand, when the device status is fixed at the time of registration, but the device status is held at the time of authentication, since the accuracy of the user's signature input is poor, the user's own authentication success rate decreases. Conversely, even when the device state is in the gripped state when registering the signature, but the device state is fixed upon authentication, the authentication success rate of the user himself will decrease. Accordingly, when the device state at the time of registration and the device state at the time of authentication are different, the authentication success threshold may be decreased, thereby increasing the authentication success rate of the user. For example, when the device state at the time of registration and the device state at the time of authentication are different from each other, the authentication success threshold may be reduced from 80 to 70. In addition, the authentication success threshold may be reduced from 90 to 70 when the device state at the time of registration and the device state at the time of authentication are different.

Even when both the state of the signature authentication device 150 at the time of signature input for authentication and the state of the device at the time of signature registration are in the gripped state, the accuracy of the user's signature input may decrease, so that the user's own authentication success rate may decrease. By lowering the authentication success threshold used for authenticating the Edo signature, it is possible to increase the authentication success rate of the user. For example, when the device state at the time of registration and the device state at the time of authentication are in the gripped state, the authentication success threshold may be reduced from 80 to 65.

The authentication success threshold is one embodiment, and it is easy for those of ordinary skill in the art that the authentication success threshold can be changed in response to the function or performance of the device 150 in a fixed state and a gripped state. It will be understood.

2 is a flowchart illustrating a signature registration method according to an embodiment of the present invention.

First, a signature for registration is input from the user (S210). While the signature is being input, the information on the user's signature input posture or the state of the signature registration device 100 according to the user's posture is determined (S220). As described above, the state of the signature registration device 100 may be determined according to a sensed inclination and/or a sensed movement degree of the device 100 when a signature is input. While storing the input information on the signature in the storage unit 140, information on the state of the signature registration device 100 is also stored (S230). The information on the signature may include information on characteristics such as a signature shape, a speed of signature input, and a pressure to be sensed. The information on the state of the signature registration device 100 may include information on the direction and/or acceleration of the device 100, or may include information indicating a fixed state or a gripping state determined using this information.

3A and 3B are diagrams for explaining a state of a signature registration device and/or a signature authentication device according to an embodiment of the present invention.

Referring to FIG. 3A, a user inputs a signature while placing the device 320 on a desk. When determining the state of the device 320 using the pitch information, the pitch of the device 320 will be close to 0 degrees, and accordingly, the state of the device 320 will be determined to be a fixed state. When determining the state of the device 320 using the acceleration information, the sensor value input from the speed sensor of the device 320 will be the same fixed value, and accordingly, the state of the device 320 will be determined as a fixed state. When determining the state of the device 320 using the acceleration information, the amount of change in the acceleration value corresponding to the device 320 is a predetermined range (e.g., -1 ≤ x-axis ≤ 1 ㎨, -1 ≤ y-axis ≤ 1 ㎨, -1 ≤ z-axis ≤ 1 ㎨), and accordingly, the state of the device 320 may be determined as a fixed state.

The acceleration sensor may output a certain value to the control unit. When a change in acceleration occurs in the device 320, the controller may determine the state of the device 320 based on the amount of change in the acceleration. In addition, the state of the device 320 may be determined as a fixed state or a gripping state by using all information on the pitch and acceleration of the device 320.

It will be readily understood by those of ordinary skill in the art that the predetermined range can be changed according to the performance of the acceleration sensor and the performance of the device.

Referring to FIG. 3B, a user inputs a signature while holding the device 320 in the hand 310. When determining the state of the device 320 using the pitch information, the pitch of the device 320 will represent an angle 330 of about 30 to 45 degrees, not horizontal, and accordingly, the state of the device 320 is a gripping state. Will be judged as. When determining the state of the device 320 using acceleration information, the sensor value input from the speed sensor due to the movement of the device 320 will be a value that is frequently changed, and the state of the device 320 is determined to be a gripping state accordingly. Will be. In addition, the state of the device 320 may be determined as a fixed state or a gripping state by using all information on the pitch and acceleration of the device 320.

4 is a flowchart illustrating a signature authentication method according to an embodiment of the present invention.

In order to unlock the signature authentication device 150 in which a user who wants to use the device 150 is locked, a signature is input (S410). While the signature is being input, the state of the signature authentication device 150 is determined (S420). The state of the device 150 may be determined according to a sensed tilt and/or a sensed movement degree of the device 150 when a signature is input. The information on the state of the device 150 may include information on the direction or acceleration of the device 150, or may include information indicating a fixed state or a gripping state determined using this information. The signature information input during authentication is compared with the signature registered by the user, and whether or not authentication is successful is determined according to the comparison result (S430).

In authenticating the input signature, information on the device state at the time of signature registration and information on the state determined in step S420 are referred to. For example, when the device state at the time of registration and the device state at the time of authentication are both fixed, authentication is processed by an authentication routine set to a basic value without changing a weight for each feature or an authentication success threshold. If both the device state at the time of registration and the device state at the time of authentication are in the gripped state, it is difficult to ensure the stability of the input data due to the shaking of the devices 100 and 150, so that the authentication success threshold is lowered to improve the authentication success rate. I can. When the device state at the time of registration and the device state at the time of authentication are different, since data such as pressure input at the time of signature registration and at the time of signature authentication are different, the weight for each feature for calculating the degree of matching between signatures can be changed. Optionally, or together with a weight change, the authentication success threshold may be changed. This is because if the posture of the user at the time of registration and the posture of the user at the time of authentication are statistically different, the degree of matching tends to decrease.

5 is a flowchart illustrating an embodiment of the present invention and a related signature registration and authentication method, and illustrates a method of registering a signature in one device and performing signature authentication to access the device.

When the user inputs a signature (S510), information on the input signature is generated (S512). The information on the signature may include information such as a shape of a signature composed of touch coordinates, a signature input speed calculated by a time at which each touch coordinate is received, and a pressure at the time of a touch. While the signature is being input, information on the user's posture, that is, the state of the device is generated (S514). The user's posture may be classified into a fixed state or a gripped state. It is determined whether a signature registration procedure is currently being performed or a signature authentication procedure is being performed (S516). In the case of a signature registration procedure, information about the signature and information about the user's attitude are stored in the storage unit 140 to register the signature (S518).

In the case of the signature authentication procedure, information on the user's attitude (eg, the state of the device) at the time of registration and the registered signature are read from the storage unit 140 (S520). When calculating the matching degree between the registration signature and the authentication signature, the weight for each characteristic of the signature is changed by referring to the user attitude information in the signature authentication procedure and the user attitude information in the signature registration procedure (S522). In addition, the authentication success threshold is calculated by referring to the user attitude information in the signature authentication procedure and the user attitude information in the signature registration procedure (S524). It is determined whether or not authentication is successful by signing using the matching degree and the authentication success threshold value calculated above (S526).

6 is a diagram for describing an operation between a device and a wearable device related to another embodiment of the present invention.

Referring to FIG. 6, a wearable device (wearable device) 1100 and a signature registration device (or signature authentication device) 1000 may be wirelessly interconnected. The wearable device 1100 includes a watch, glasses, ring, bracelet, necklace, or an accessory type including a hand held bar type, a textile product or a textile/clothing type including a clothing-integrated computer, and skin. Alternatively, it may include a body attachment type including a skin patch sensor attachable to the body or a living body implantation type including a biotransplant sensor implantable into a human body (living body).

The wearable device 1100 may wirelessly transmit sensing information detected through the sensor at periodic intervals or at a request from a device (a signature registration device or a signature authentication device, 1000) to a device (a signature registration device or a signature authentication device, 1000). have.

In an embodiment of the present invention, the wearable device 1100 can be attached (or worn) either in contact or non-contact with the user, and a sensor capable of detecting the user's state according to the control of the controller (eg, tilt sensor, motion sensor, A gyro sensor, a temperature sensor, etc.) and a communication unit capable of transmitting a user's state.

A user wears the wearable device 1100 on a wrist or head, and inputs a signature into the device 1000 using a finger including an index finger or an input tool such as a stylus pen 1001.

7 is a block diagram illustrating a device and a wearable device related to another embodiment of the present invention.

Referring to FIG. 7, the device 1000 includes an input unit 1010, a control unit 1020, a sensing unit 1030, a storage unit 1040, and a communication unit 1050. The control unit 1020 may control the input unit 1010, the detection unit 1030, the storage unit 1040, and the communication unit 1050.

The controller 1020 controls the overall operation of the device 1000 and a signal flow between the internal components 1010 to 1050 of the device 1000, and performs a function of processing data. When there is a user input or a preset and stored condition is satisfied, the control unit 1020 may execute an OS (Operation System) and various applications stored in the storage unit 1040.

Components 1010 to 1040 except for the communication unit 1050 are substantially the same as those of an embodiment of the present invention (FIGS. 1A and 1B), and thus redundant descriptions are omitted.

The communication unit 1050 may connect the device 1000 with the wearable device 1100 under the control of the controller 1020. The controller 1020 may receive state information of a user from the wearable device 1100 connected through the communication unit 1050. In addition, the communication unit 1050 may be connected to an external server (not shown) under the control of the controller 1020 to download an application or transmit/receive data for web browsing. The communication unit 1050 may include one of a wireless LAN (not shown) and a short-range communication unit (not shown) corresponding to the performance and structure of the device 1000. In addition, the communication unit 1050 may include a combination of a wireless LAN (not shown) and a short-range communication unit (not shown) corresponding to the performance and structure of the device 1000.

The wireless LAN (not shown) may be connected to an access point (AP) using wireless at a place where an access point (AP) (not shown) is installed under the control of the controller 1020. The wireless LAN (not shown) supports the wireless LAN standard (IEEE802.11x) of the American Institute of Electrical and Electronic Engineers (IEEE). The short-range communication unit (not shown) includes Bluetooth, Bluetooth low energy, infrared data association (IrDA), Wi-Fi, Ultra Wideband (UWB), and Near Field Communication (NFC). ) And the like.

Components (for example, 1010 to 1050) illustrated in the device 1000 of FIG. 7 may have at least one component added or deleted corresponding to the performance of the device 1000. In addition, it will be readily understood by those of ordinary skill in the art that the positions of the components (eg, 1010 to 1050) may be changed corresponding to the performance or structure of the device 1000.

The wearable device 1100 includes a control unit 1110, a communication unit 1130, a camera unit 1140, a detection unit 1150, a display unit 1170, a speaker 1175, a storage unit 1180, and/or a power supply unit ( 1190). For example, the wearable device 1100 includes a control unit 1110, a communication unit 1130, a sensing unit 1150, a storage unit 1180, and a power unit 1190. The wearable device 1100 may include a control unit 1110, a communication unit 1130, a camera unit 1140, a sensing unit 1150, a storage unit 1180, and a power unit 1190. The wearable device 1100 may include a control unit 1110, a communication unit 1130, a camera unit 1140, a detection unit 1150, a display unit 1170, a storage unit 1180, and/or a power unit 1190. have. In addition, the wearable device 1100 includes a control unit 1110, a communication unit 1130, a camera unit 1140, a sensing unit 1150, a display unit 1170, a speaker 1175, a storage unit 1180, and a power unit 1190. ) Can be included.

The controller 1110 stores a processor (Processor, 1111), a ROM (ROM, 1112) in which a control program for controlling the wearable device 1100 is stored, and a signal or data input from the outside of the wearable device 1100, or A RAM 1113 used as a storage area corresponding to various operations performed by the device 1100 may be included. In addition, the control unit 1110 may include a processor 1111 and a flash memory (not shown). It will be readily understood by those of ordinary skill in the art that the configuration of the control unit 1110 may be implemented in various ways according to an embodiment of the present invention.

The controller 1110 controls the overall operation of the wearable device 1100 and a signal flow between the internal components 120 to 190 of the wearable device 1100, and performs a function of processing data. The control unit 1110 controls power supplied from the power supply unit 1190 to the internal components 1130 to 1180. In addition, when there is a user input or a preset and stored condition is satisfied, the controller 1110 may execute an OS (Operation System) and various applications stored in the storage unit 1180.

The processor 1111 may include a graphic processing unit (not shown) for graphic processing of an image or an image. The processor 1111 may be implemented in the form of a System On Chip (SoC) including a core (not shown) and a GPU (not shown). The processor 1111 may include a single core, a dual core, a triple core, a quad core, and a multiple of cores.

The processor 1111 may be implemented with a plurality of processors including a main processor (not shown) and a sub processor (not shown). The subprocessor refers to a processor operating in a sleep mode. In addition, the processor 1111, the ROM 1112, and the RAM 1113 may be interconnected through an internal bus.

In an embodiment of the present invention, the control unit 1110 of the wearable device may be used as a term referring to a component including the processor 1111, the ROM 1112, and the RAM 1113.

It will be readily understood by those of ordinary skill in the art that the operation of the control unit 1110 may be implemented in various ways according to an embodiment of the present invention.

The communication unit 1130 may wirelessly connect the wearable device 1100 to the device 1000 under the control of the controller 1110. The controller 1110 may download an application or browse the web from an external device (eg, a server) connected through the communication unit 1130. The communication unit 1130 may include one of a wireless LAN (not shown) and a short-range communication unit (not shown) corresponding to the performance and structure of the wearable device 1100. In addition, the communication unit 1130 may include a combination of a wireless LAN (not shown) and a short-range communication unit (not shown).

The wireless LAN (not shown) may be connected to an access point (AP) by wireless at a place where an access point (AP) (not shown) is installed under the control of the controller 1110. The short-range communication unit (not shown) includes Bluetooth, Bluetooth low energy, infrared data association (IrDA), Wi-Fi, Ultra Wideband (UWB), and/or NFC (Near NFC). Field Communication) and the like.

The communication unit 1130 may transmit state information of a user corresponding to the sensing information sensed through the sensing unit 1150 to the device 1000 in data form under the control of the controller 1110.

The camera unit 1140 captures a still image or a video in a direction desired by the user under the control of the controller 1110. In addition, the camera unit 1140 may capture a still image or a video corresponding to a user's request direction under the control of the controller 1110. The camera unit 1140 may convert the received image under the control of the controller 1110 and output it to the controller 1110.

The camera unit 1140 may include a lens (not shown) and an image sensor (not shown). The camera unit 1140 may support optical zoom (eg, 5x optical zoom) or digital zoom (eg, 10x digital zoom) using a plurality of lenses and image processing. . The recognition range of the camera unit 1140 may be variously set according to an angle between the camera and the user and environmental conditions.

When the camera unit 1140 includes a plurality of cameras, adjacent to the first camera (not shown) at the top of the bezel (for example, the distance with the first camera is greater than 2 cm, less than 8 cm) A 3D still image or 3D motion may be received using a second camera (not shown).

The camera unit 1140 may be implemented integrally with the wearable device 1100 or may be implemented separately. A device (not shown) including the separated camera unit 1140 may be connected to the wearable device 1100 via wire/wireless communication unit 1130 or an input/output unit (not shown).

The control unit 1110 uses the still image or video received from the camera unit 1140 to shake the hand of the user wearing the wearable device 1100 (for example, to wear it on the wrist) or shake the user (for example, Wear on the head). In addition, the controller 1110 may transmit the received still image or video to the outside using the communication unit 1130.

The detection unit 1150 may detect a user's state while a signature is input (eg, signature registration or signature authentication) under the control of the controller 1110. The user's state is a condition or situation that affects the user's signature input, for example, the user's hand shaking degree, the user's shaking degree, and the user's hand with the wearable device 1100 attached. It may include a location, a user's operating state, or a user's blood alcohol concentration.

The detection unit 1150 may detect not only a user's state but also state information (eg, a fixed state or a gripping state) of the device 1000 for receiving a signature. For example, in the case of the wearable device 1100 worn on the user's wrist, the control unit 1110 uses the sensing information sensed through the sensing unit 1150 to use the user's state and the state of the device 1000 (e.g., For example, it is possible to determine (similar to detection in the detection unit 130).

The detection unit 1150 includes a proximity sensor, an acceleration sensor, a gyro sensor, a terrestrial magnetism sensor, an alcohol sensor, and a current skin resistance sensor. skin response sensor: GSR) and/or a pressure sensor. For example, the controller 1110 may detect the user's hand shake or the user's shake using an acceleration sensor, a gyro sensor, and/or a geomagnetic sensor. The controller 1110 may detect the user's blood alcohol concentration using a blood alcohol concentration sensor (or together with a proximity sensor). For example, the blood alcohol concentration sensor may be a bar type that is electrically connected to the device 1100. The controller 1110 may detect a user's motion (eg, moving, stopping, running, etc.) and/or a state using an acceleration sensor, a gyro sensor, and/or a geomagnetic sensor. The controller 1110 may detect a state (eg, tilt, direction, etc.) of the wearable device 1100 using an acceleration sensor, a gyro sensor, and/or a geomagnetic sensor. The controller 1110 may detect the position of the user's hand using an acceleration sensor and/or a gyro sensor. In addition, the controller 1110 may detect whether the user's exercise intensity, whether he is sleeping, whether he is moving, or whether he is walking, using an acceleration sensor, a current skin resistance sensor, and/or a pressure sensor. The control unit 1110 may detect a user's state by using a combination of various sensors included in the detection unit 1150.

The sensing unit 1150 may be integrated with the wearable device 1100 or may be a separate type. The detachable detector 1150 may be connected to the wearable device 1100 by wire or wirelessly to transmit an electrical signal corresponding to the user state detection requested from the wearable device 1100 to the wearable device 1100.

The display unit 1170 may display content (eg, video, image, text, or web page) received through the communication unit 1130 under the control of the controller 1110. Also, the display unit 1170 may output content stored in the storage unit 1180 under the control of the controller 1110. The display unit 1170 may display the state of the wearable device 1100 sensed under the control of the controller 1110 as a symbol including an animation, an image, text, and/or an emoticon.

The display unit 1170 may be implemented as a touch screen (not shown) including a touch panel (not shown) that receives a user's input (eg, single touch or multi-touch).

The speaker 1175 may output audio (eg, voice, sound) received through the communication unit 1130 or audio included in a video under the control of the controller 1110. Also, the speaker 1175 may output audio stored in the storage unit 1180 under the control of the controller 1110.

The storage unit 1180 includes a control program for controlling the internal components of the wearable device 1100 and the control unit 1110, an application initially provided by a manufacturer or downloaded from the outside, an application-related GUI (graphical user interface), and a GUI. Objects to be provided (eg, images, texts, icons, buttons, etc.), user information, documents, databases, or related data may be stored.

The storage unit 1180 may store an operating system (OS) for driving and controlling the wearable device 1100, various data, programs, or applications. In an embodiment of the present invention, the term storage unit refers to a storage unit 1180, a ROM 1112, a RAM 1113, or a memory card (e.g., a micro SD card, a USB memory) mounted on the wearable device 1100. Not). In addition, the storage unit 1180 may include a nonvolatile memory, a volatile memory, a hard disk drive (HDD), or a solid state drive (SSD).

The storage unit 1180 may include a communication module, a camera module, a detection module, a display module, a touch panel module, an audio output module, a storage module, a power module, or a related database (DB), which is not shown. Modules and databases not shown in the storage unit 1180 include a communication control function, a camera control function, a display control function, a touch panel control function, an audio output control function, a storage control function, and a power control function in the wearable device 1100. , Or may be implemented in the form of software to perform a related database (DB) control function. The controller 1110 may control the wearable device 1100 by using respective modules and software stored in the storage unit 1180.

The power supply unit 1190 supplies power input from an external power source to the components 1130 to 1180 inside the wearable device 1100 under the control of the controller 1110. In addition, the power unit 1190 may supply power to one or more batteries (not shown) located inside the wearable device 1100 under the control of the controller 1110. The battery to which power is supplied may be located between the display unit 1170 and an integral or detachable rear cover (not shown).

Components (for example, 1110 to 1180) illustrated in the wearable device 1100 of FIGS. 6 and 7 may have at least one component added or deleted corresponding to the performance of the wearable device 1100. In addition, it will be easily understood by those of ordinary skill in the art that the positions of the components (eg, 1110 to 1180) may be changed corresponding to the performance or structure of the wearable device 1100.

8 is a flowchart illustrating a device signature registration and authentication method according to another embodiment of the present invention.

10 to 14 are diagrams for explaining an example of a device signature registration and authentication method according to another embodiment of the present invention.

In step S1201 of FIG. 8, the user's signature is input.

Referring to FIG. 10, a user's signature is input through the input unit 1010 of the device 1000. A user who wears the wearable device 1100 on a wrist and holds the device 1000 inputs a signature using a finger including an index finger or an input tool such as a stylus pen 1001. Alternatively, a user who wears the wearable device 1100 on his head and holds the device 1000 inputs a signature using a finger including an index finger or an input tool such as a stylus pen 1001. In order to improve the accuracy of signature registration, the user can enter the signature multiple times.

The user's signature may be input through an environment setting of the device 1000 or through an application executed to register a signature.

The storage unit 1040 of the device 1000 may store a user signature received under the control of the controller 1010. In addition, the storage unit 1040 of the device 1000 includes characteristics of the user signature received under the control of the controller 1010 (eg, the shape of the signature, the speed of the signature input, and/or the pressure at the time of the detected input). Can be saved.

Referring to FIG. 11, a screen or a web page (not shown) of an application 1410 executed in the device 1000 may be displayed. The application 1410 may be a shopping application and may be downloaded from the outside. The displayed screen of the application 1410 may be an order form for a product to be purchased (eg, a sound bar).

When the signature input field 1411 is touched by the input pen 1001 on the screen of the application 1410, the controller 1010 may display a popup 1412 for inputting a signature. The displayed pop-up 1412 may have a larger area than the signature input field 1411.

The user may input an authentication signature in the enlarged pop-up 1412 using the input pen 1001. When the input of the authentication signature is completed, the pop-up 1412 disappears, and the input authentication signature may be displayed in the signature input field 1411.

Referring to FIG. 6, the user may touch the screen of the device 1000 with the input pen 1001 to unlock the screen of the device 1000. In response to the touch of the input pen 1001, the controller 1010 may display a pop-up. The user may input a signature using the input pen 1001 to unlock the screen of the device 1000.

In step S1202 of FIG. 8, the device requests sensing information from the wearable device.

The controller 1010 of the device 1000 may search for a wearable device capable of detecting a user's state through the communication unit 1050 through a known wireless network (eg, Bluetooth, wireless LAN, short-range communication, etc.). In addition, the control unit 1010 of the device 1000 uses a wearable device capable of detecting a user's state through the communication unit 1050 and a known wireless network (for example, Bluetooth, wireless LAN, or short-range communication). You can reconnect with

When a user's signature is input, the controller 1010 may search for the wearable device 1100. When one of the signature input field 1411 and the signature input pop-up 1412 is displayed on the screen of the device 1000, the controller 1010 may search for the wearable device 1100. In addition, when the input of the user signature is completed, the controller 1010 may search for the wearable device 1100.

The controller 1010 may wirelessly connect to the searched wearable device (eg, a wrist worn wearable device). The controller 1010 of the device 1000 requests sensing information corresponding to the user's state from the wirelessly connected wearable device 1100.

In response to a request from the device 1000, the control unit 1110 of the wearable device 1100 may detect a user state by using the detection unit 1150. The control unit 1110 of the wearable device 1100 uses an application (not shown) that detects a user state in response to a request of the device 1000, a software program or a program included in the OS, and the detection unit 1150. The user's condition can be detected. In addition, the control unit 1110 of the wearable device 1100 may detect a user's state by using the detection unit 1150 in an application (not shown) that is being executed in response to a request of the device 1000.

For example, in one of the various user's states, in the low hand shaking state, the range of acceleration detected from the sensing unit 1150 is -1.5 = x-axis = 1.5 ㎨, -1.5 = y-axis = 1.5 ㎨, It can be set within -1.5 = z-axis = 1.5 ㎨). The range of the detected acceleration can also be determined as a vector sum of the X-axis, Y-axis and Z-axis. In addition, in the case of high hand shake, the range of acceleration detected from the sensing unit 1150 can be set within -12.5 = x-axis = 12.5 ㎨, -12.5 = y-axis = 12.5 ㎨, -12.5 = z-axis = 12.5 ㎨). . The range of the detected acceleration can also be determined as a vector sum of the X-axis, Y-axis and Z-axis.

According to an embodiment of the present invention, the hand shaking state is one embodiment, and it is a technology in the art that the range or size of each sensor detection value detected by various sensors of the detection unit 1150 may be changed according to various user states. It will be readily understood by those of ordinary skill in the field.

The control unit 1110 of the wearable device 1100 uses an application (not shown) that detects a user state in advance, a software program or a program included in the OS, and the detection unit 1150 before requesting the device 1000 Thus, the user's state can be detected periodically (for example, 1 min, changeable).

The sensing unit 1150 may generate an electrical signal corresponding to a state of a user wearing the wearable device 1100 and transmit the generated electrical signal to the controller 1110. For example, the acceleration sensor may transmit an electrical signal corresponding to the detection of a change in speed per unit time in the X-axis, Y-axis, and Z-axis directions of the wearable device 1100 to the controller 1110. The gyro sensor may transmit an electrical signal corresponding to the detection of the rotation angle per unit time of the wearable device 1100 to the controller 1110. The geomagnetic sensor may transmit an electrical signal corresponding to detection (eg, azimuth) of the surrounding geomagnetism of the wearable device 1100 to the control unit 1110. The blood alcohol concentration sensor may transmit an electrical signal corresponding to detection of the alcohol concentration included in the user's exhalation to the controller 1110. The current skin resistance sensor GSR may transmit an electrical signal corresponding to the detection of the electrical conductivity of the user's skin (eg, the degree of activation of the sympathetic nerve) to the controller 1110. The pressure sensor may transmit an electrical signal corresponding to the detection of the input signature pressure to the controller 1110. The proximity sensor may transmit an electrical signal corresponding to detection of the user's approach to the wearable device 1100 to the controller 1110.

The controller 1110 may determine a user's state (eg, a hand shake degree, a user shake degree, a user's operation degree, blood alcohol concentration, etc.) by using an electric signal received from the detector 1150. The control unit 1110 corresponds to an electrical signal received from the sensing unit 1150 and a user state reference stored in the storage unit 1110 (e.g., an acceleration sensor, a gyro sensor, and/or an electrical signal detected by a geomagnetic sensor). The user status can be determined using a user status criterion, not shown). It will be readily understood by those of ordinary skill in the art that the user status criterion may be changed according to the type and function of the sensor included in the wearable device 1100.

The controller 1110 may store an electrical signal received from the sensing unit 1150 in the storage unit 1180. The controller 1110 may store electrical signals received from one or a plurality of sensors in the storage unit 1180. In addition, the controller 1110 may store user state information corresponding to the user state in the storage unit 1180. For example, the user status information includes detection sensor name, detection sensor identifier (ID), detection time, sensor detection value (e.g., voltage, current, etc.), user status (e.g., hand shaking, shaking, walking, etc.) A code corresponding to jogging, etc.) may be included.

In an embodiment of the present invention, the sensing information may mean including user state information or an electrical signal received from a sensor.

The control unit 1110 of the wearable device 1100 may transmit sensing information corresponding to the request of the device 1000 to the device 1000 using the communication unit 1130. The control unit 1110 of the wearable device 1100 uses the communication unit 1130 to transmit sensing information corresponding to the request of the device 1000 in real time or delay (for example, 5 sec or less from detection to transmission) to the device 1000. ).

In step S1203 of FIG. 8, the device receives sensing information from the wearable device.

The controller 1010 of the device 1000 may receive sensing information corresponding to the request of the device 1000 from the wearable device 1100 using the communication unit 1050. The sensing information may include one of user state information and an electric signal. The control unit 1010 may temporarily store the received sensing information in the storage unit 1080. Received sensing information includes detection sensor name, detection sensor identifier (ID), detection time, sensor detection value (eg, voltage, current, etc.), user status (eg, hand shaking, shaking, walking, jogging, etc.) It may include a code corresponding to.

In step S1204 of FIG. 8, the device determines a user state.

The controller 1010 of the device 1000 may determine the user's state (eg, walk) using the user state information included in the received sensing information. Alternatively, the controller 1010 of the device 1000 may determine the state of the user (eg, walk) by using an electric signal included in the received sensing information. Also, the controller 1010 of the device 1000 may determine whether to register the signature information using the input user signature information (eg, the shape of the signature, the speed of the signature input, or the detected signature pressure).

In step S1205 of Fig. 8, the device determines whether to proceed with the signature registration procedure.

The controller 1010 of the device 1000 may determine whether to pre-store the storage unit 1040 using the input user signature information. For example, when there is no identical user signature information in the storage unit 1040 (eg, when registering a user signature for the first time), the control unit 1010 of the device 1000 may determine registration of the user signature information. . In addition, when one of the signature registration procedure and the signature authentication procedure is selected by the user, the controller 1010 of the device 1000 may perform the selected procedure. When the signature registration procedure is selected by the user, the control unit 1010 of the device 1000 may perform the signature registration procedure. In this case, the process proceeds to step S1206 of FIG. 8.

When there is the same user signature information in the storage unit 1040, the control unit 1010 of the device 1000 may determine authentication of the user signature information. In addition, when the signature authentication procedure is selected by the user, the controller 1010 of the device 1000 may perform the signature authentication procedure. In this case, the process proceeds to step S1207 of FIG. 8.

In addition, the control unit 1010 of the device 1000 determines whether the signature registration procedure is currently being performed or the signature authentication procedure is being performed, and in the case of the signature registration procedure, the process proceeds to step S1206 of FIG. 8, and in the case of the signature authentication procedure, , May proceed to step S1207 of FIG. 8.

In step S1206 of FIG. 8, the device stores signature information and user state information.

The control unit 1010 of the device 1000 may store user signature information and user state information received according to the signature registration procedure in the storage unit 1040. In addition, the control unit 1010 of the device 1000 may store user signature information and user state information received from the wearable device 1100 and temporarily stored in the storage unit 1040 according to a signature registration procedure.

When the user signature information and the user state information are stored in the storage unit 1040, the signature registration method of the device is terminated.

Returning to step S1205 of FIG. 8, if the storage unit 1040 has the same user signature information, the process proceeds to step S1207 of FIG. 8 for performing a signature authentication procedure.

In step S1207 of FIG. 8, the device determines whether to authenticate the signature using the stored signature information and user state information, the input signature information, and the received user state information.

The control unit 1010 of the device 1000 may authenticate the input user signature by using the signature information and user status information stored in the storage unit 1040, the input signature information, and the received user status information. The control unit 1010 calculates a degree of matching using the previously registered signature information and the input signature information. The controller 1010 may determine whether to authenticate the input user signature by comparing the calculated matching result with an authentication success threshold. Calculation of the degree of matching and whether to authenticate the signature may use stored signature information, user status information, input signature information, and received user status information.

The control unit 1010 of the device 1000 may change a weight for each feature corresponding to the matching degree calculation using the registered (pre-stored) user state information and the input user state information. In addition, the controller 1010 of the device 1000 may change the authentication success threshold using registered (pre-stored) user state information and input user state information.

When the user status (e.g., low hand shake) when signing registration and the user status (e.g., low hand shaking) when signing authentication are the same (when the input accuracy of the registered user signature and the authentication user signature is high) ), the control unit 1010 of the device 1000 may perform the signature authentication procedure without changing the weight for each feature and changing the authentication success threshold.

In response to the comparison result of the user status in the case of signature registration and the user status in the case of signature authentication, the control unit 1010 features features (e.g., signature shape, signature You can change the weight for each input speed or the pressure of the input signature). Each signature feature has a weight corresponding to its importance in calculating the degree of matching. For example, when calculating the matching degree, the controller 1010 may calculate the matching degree by setting the weight of the signature shape to 30, the weight of the signature speed to 30, and the weight of the input signature pressure to 40. The sum of weights applied to calculation of the matching degree may be 100. In addition, even when the weights for each feature are respectively changed by the control unit 1010, the sum of the weights may be equal to 100.

Consider a case in which a user registers a signature through the device 1000 in a low hand shake state and a case in which the user inputs an authentication signature through the device 1000 in a high hand shake state. When the control unit 1010 applies a reference weight (eg, 30, 30, 40), a true acceptance rate (TAR) may be lowered due to a difference between the characteristics of the registration signature and the characteristics of the authentication signature. . The control unit 1010 may improve the self-authentication success rate (TAR) by changing the reference weight (eg, 30, 30, 40) of the signature feature to 40, 35, and 25, respectively, and calculating the matching degree.

The weight of each signature feature according to the embodiment of the present invention is one embodiment, and the weight of each signature feature corresponding to the user's state (eg, hand shaking, user shaking, user's motion, walking or jogging, etc.) It will be readily understood by those of ordinary skill in the art that can be changed.

The control unit 1010 increases the identity authentication rate by changing the authentication success threshold for authenticating the input signature in response to the comparison result of the user state in the case of signature registration and the user state in the case of signature authentication. I can. The authentication success threshold is a reference value that is determined as authentication success in consideration of the degree of similarity between the registered signature and the signature input for authentication.

For example, if the set authentication success threshold is 85, and the user state with low hand shake when signing registration and the user state with low hand shake when signing authentication (e.g., low hand shake), the user's The identity authentication success rate (TAR) may be 96%.

In a user state of low hand shake when signing registration and a user state of high hand shake when signing authentication, a success rate of the user's identity authentication may be lowered due to a difference in accuracy of the input user's signature. In addition, in a user state of high hand shake when signing registration and a user state of low hand shake when signing authentication, the user's identity authentication success rate may be lowered due to a difference in accuracy of the input user signature.

When the user state in the case of signing registration and the user state in the case of signing authentication are different, the control unit 1010 may change (eg, decrease) an authentication success threshold to improve a self-authentication success rate. For example, if the user state in the case of signing registration and the user state in the case of signature authentication are different, the controller 1010 may change the authentication success threshold value from 85 to 70. In addition, when the user status in the case of signing registration and the user status in the case of signature authentication are different, the control unit 1010 may change the authentication success threshold value from 90 to 75.

In the user state of high hand shake when signing registration and the user state of high hand shake when signing authentication, the success rate of the user's identity authentication may be lowered due to a difference in accuracy of the input user's signature. When the user status in the case of sign registration and signature authentication is a high hand shake state, the controller 1010 may change (eg, decrease) an authentication success threshold to improve a self-authentication success rate. For example, when both the signature registration and the signature authentication are in a high hand shake state, the controller 1010 may change the authentication success threshold from 80 to 70.

The authentication success threshold according to the embodiment of the present invention is one example, and it is understood that the authentication success threshold can be changed in response to the user's state (eg, shaking hands, walking, taking a walk, jogging, etc.). It will be readily understood by those of ordinary skill in the art.

In step S1208 of FIG. 8, the device determines whether to authenticate the signature.

The controller 1010 of the apparatus 1000 may determine whether to authenticate the signature in response to a comparison result of the stored signature information and user state information, the input signature information, and the received user state information.

12 and 11, the control unit 1010 of the device 1000 may display a pop-up according to whether signature is authenticated. When the input signature is authenticated, the controller 1010 displays a pop-up 1413 corresponding to the authentication success. Alternatively, when the input signature is authenticated, the controller 1010 may display a pop-up 1413 including authentication success and a comment. When the pop-up 1413 is selected or closed by the user, the process proceeds to step S1209 of FIG. 8.

When the input signature fails to authenticate, the control unit 1010 displays a pop-up 1414 corresponding to the authentication failure. Alternatively, when the input signature fails to authenticate, the controller 1010 may display a pop-up 1414 including retry 1414a and retry and cancel 1414b as well as authentication failure. When the pop-up 1414 is selected or closed by the user, the signature authentication method of the device is terminated.

In step S1209 of FIG. 8, the device performs a function.

The controller 1010 of the device 1000 may perform a function in response to signature authentication. For example, when signature is authenticated, the controller 1010 may purchase a product through the shopping application 1410. Also, the controller 1010 may unlock the screen of the device 1000 by using an authentication signature.

When the device 1000 performs the corresponding function, the signature authentication method of the device is terminated.

9 is a flowchart illustrating a device signature registration and authentication method according to another embodiment of the present invention.

In step S1301 of FIG. 9, the user's signature is input.

Referring to FIG. 10, a user's signature is input through the input unit 1010 of the device 1000. The user wears the wearable device 1100 on a wrist or on his head, and the user who holds the device 1000 inputs a signature using a finger including an index finger or an input pen 1001 such as a stylus pen.

Since the input of the user signature in step S1301 of FIG. 9 is substantially similar to the input of the user signature in step S1201 of FIG. 8, a redundant description is omitted.

In step S1302 of FIG. 9, status information of the device is received.

When a user's signature is input, the controller 1010 of the device 1000 may detect the direction and/or movement of the device using the detection unit 1030. The sensed direction and/or movement of the device may be transmitted to the controller 1010.

The reception of the state information of the device 1000 in the step S1302 of FIG. 9 is the state of the device 1000 in the step S220 of FIG. 2, the step S420 of FIG. 4, or the step S514 of FIG. Since it is substantially similar to the reception of information, a redundant description is omitted.

In step S1303 of FIG. 9, the device requests sensing information from the wearable device.

The controller 1010 of the device 1000 may search for a wearable device capable of detecting a user's state through the communication unit 1050 through a known wireless network (eg, Bluetooth, wireless LAN, short-range communication, etc.). The controller 1010 may wirelessly connect to the searched wearable device (eg, a wrist worn wearable device). The controller 1010 of the device 1000 requests sensing information corresponding to the user's state from the wirelessly connected wearable device 1100.

In response to a request from the device 1000, the control unit 1110 of the wearable device 1100 may detect a user state by using the detection unit 1150.

The request for sensing information and the detection of user information from the wearable device in step S1303 of FIG. 9 are substantially similar to the request for sensing information from the wearable device and detection of the user state in step S1202 of FIG. Omitted.

In step S1304 of FIG. 9, the device receives sensing information from the wearable device.

The controller 1010 of the device 1000 may receive sensing information corresponding to the request of the device 1000 from the wearable device 1100 using the communication unit 1050.

The reception of sensing information from the wearable device in step S1304 of FIG. 9 is substantially similar to the reception of sensing information from the wearable device in step S1203 of FIG.

In step S1305 of FIG. 9, the device determines a device state and a user state.

The controller 1010 of the device 1000 may determine a state (eg, a fixed state or a gripping state) of the device 1000 by using a sensor value received from the sensing unit 1030. The controller 1010 of the device 1000 may determine a user's state (eg, walking) using the received sensing information.

Since the determination of the device state in step S1305 of FIG. 9 is substantially similar to the determination of the user state in step S220 of FIG. 2 or step S420 of FIG. 4, duplicate descriptions are omitted. Since the determination of the user state in step S1305 of FIG. 9 is substantially similar to the determination of the user state in step S1204 of FIG. 8, a redundant description will be omitted.

In step S1306 of Fig. 9, the device determines whether to proceed with the signature registration procedure.

The controller 1010 of the device 1000 may determine whether to pre-store the storage unit 1040 using the input user signature information.

The determination of whether or not the signature registration procedure in step S1306 of FIG. 9 is substantially similar to the determination of whether or not the signature registration procedure in step S1205 of FIG. 8, and thus, a duplicate description is omitted.

In step S1207 of FIG. 9, the device stores signature information, device status information, and user status information.

The controller 1010 of the device 1000 may store user signature information, device state information, and user state information received according to the signature registration procedure in the storage unit 1040. In addition, the control unit 1010 of the device 1000 may store user signature information, device state information, and user state information received from the wearable device 1100 and temporarily stored in the storage unit 1040 according to the signature registration procedure.

When the user signature information, device state information, and user state information are stored in the storage unit 1040, the signature registration method of the device is terminated.

Returning to step S1306 of Fig. 9, if the storage unit 1040 has the same user signature information, the process proceeds to step S1308 of Fig. 9 for performing a signature authentication procedure.

In step S1308 of FIG. 9, the device determines whether to authenticate the signature using the stored signature information, device state information and user state information and input signature information, device state information, and received user state information.

The controller 1010 of the device 1000 is a user input using signature information, device state information, user state information and input signature information, device state information, and received user state information stored in the storage unit 1040. Signature can be verified. The control unit 1010 calculates a degree of matching using the previously registered signature information and the input signature information. The controller 1010 may determine whether to authenticate the input user signature by comparing the calculated matching result with an authentication success threshold. To calculate the degree of matching and whether to authenticate the signature, stored signature information, device state information, user state information and input signature information, device state information, and received user state information may be used.

The control unit 1010 of the device 1000 may change the weight for each feature corresponding to the matching degree calculation by using the registered (pre-stored) device state information and user state information, and the input device state information and user state information. have. In addition, the control unit 1010 of the device 1000 may change the authentication success threshold using the registered (pre-stored) device state information and user state information, and the input device state information and user state information.

In the case of signature registration, the device's state (e.g., fixed state) and user state (e.g., low hand shake), and in the case of signature authentication, the device's state (e.g., fixed state) and user state ( For example, when low hand shaking) is the same (when the input accuracy of the registered user signature and the authentication user signature is high), the control unit 1010 of the device 1000 signs without changing the weight for each feature and changing the authentication success threshold. You can perform the authentication process.

In response to the comparison result of the user status in the case of signature registration and the user status in the case of signature authentication, the control unit 1010 features features (e.g., signature shape, signature You can change the weight for each input speed or the pressure of the input signature). Each signature feature has a weight corresponding to its importance in calculating the degree of matching. For example, when calculating the matching degree, the controller 1010 may calculate the matching degree by setting the weight of the signature shape to 30, the weight of the signature speed to 30, and the weight of the input signature pressure to 40. The sum of weights applied to calculation of the matching degree may be 100. In addition, when the weights for each feature are respectively changed by the control unit 1010, the sum of the weights may be equal to 100.

Consider a case in which a user registers a signature through the device 1000 in a fixed state and low hand shake state, and a case in which the user inputs an authentication signature through the device 1000 in a fixed state and high hand shake state. When the control unit 1010 is in a fixed state and applies a reference weight (eg, 30, 30, 40) to the device 1000 having a difference in hand shake, the difference between the characteristics of the registration signature and the characteristics of the authentication signature The True Accept Rate (TAR) may decrease. The control unit 1010 may improve the self-authentication success rate (TAR) by changing the reference weight (eg, 30, 30, 40) of the signature feature to 40, 35, and 25, respectively, and calculating the matching degree.

The weight of each signature feature according to the embodiment of the present invention is one embodiment, and the state of the device (e.g., stationary state, grip state) and the state of the user (e.g., hand shaking, motion, walking or jogging) Etc.), it will be readily understood by those of ordinary skill in the art that the weight of each signature feature can be changed.

In response to the comparison result of the device state and user state in the case of signature registration and the device state and user state in the case of signature authentication, the control unit 1010 changes the authentication success threshold for authentication of the input signature to increase the identity authentication rate. You can increase it. The authentication success threshold is a reference value that is determined as authentication success in consideration of the degree of similarity between the registered signature and the signature input for authentication.

For example, the set authentication success threshold is 85, the device 1000 in a fixed state when registering a signature, and the device 1000 in a stationary state in the case of signing authentication and a user state of low hand shake, and a low hand shake. In the case of the user state (eg, low hand tremor), the user's identity authentication success rate (TAR) may be 94%.

According to the difference in the accuracy of the input user signature in the fixed state device 1000 and the user state of low hand shake when signing registration, and the stationary device 1000 state when signing authentication and the user state of high hand shake. The success rate of user authentication may decrease. In addition, in a user state of high hand shake when signing registration and a user state of low hand shake when signing authentication, the user's identity authentication success rate may be lowered due to a difference in accuracy of the input user signature.

When the device 1000 and the user state in the fixed state when signing is registered and the device 1000 and the user state in the stationary state when the signature is authenticated are different, the control unit 1010 changes the authentication success threshold (for example, , Decrease) to improve the success rate of identity authentication. For example, if the device 1000 and the user state in the fixed state when signing is registered and the device 1000 and the user state in the stationary state in the case of signing authentication are different, the control unit 1010 sets the authentication success threshold to 85. It can be changed from to 65. In addition, when the user state in the case of signing registration and the user state in the case of signature authentication are different, the control unit 1010 may change the authentication success threshold value from 93 to 74.

In the case of registering a signature, in the fixed state device 1000 and the user state with high hand shake, and the device in the stationary state when signing authentication, and the user state having high hand shake, the difference in the accuracy of the input user signature The success rate of user authentication may decrease. When both the device 1000 in the fixed state in the case of sign registration and signature authentication and the user state are in a high hand shake state, the control unit 1010 changes (for example, decreases) the authentication success threshold to increase the authentication success rate. Can be improved. For example, when both the signature registration and the signature authentication are in a high hand shake state, the controller 1010 may change the authentication success threshold from 82 to 71.

The authentication success threshold according to the embodiment of the present invention is an example, and the authentication success threshold value corresponds to the state of the device 1000 and the state of the user (eg, shaking hands, walking, taking a walk, jogging, etc.) It will be readily understood by those of ordinary skill in the art that this can be changed. For example, in the case of registering a signature, the device 1000 in a fixed state and a combination of each device state of the user state (eg, shaking hand, walking, jogging, or drunk) and a user state (eg, device Depending on the number of states X the number of user states), the authentication success threshold may be changed.

In step S1309 of Fig. 9, the device determines whether to authenticate the signature.

The control unit 1010 of the device 1000 may determine whether to authenticate the signature in response to a comparison result of the stored signature information, device state information, user state information and input signature information, device state information, and received user state information. have.

12 and 11, the control unit 1010 of the device 1000 may display a pop-up according to whether signature is authenticated. When the input signature is authenticated, the controller 1010 displays a pop-up 1413 corresponding to the authentication success. Alternatively, when the input signature is authenticated, the controller 1010 may display a pop-up 1413 including authentication success and a comment. When the pop-up 1413 is selected by the user, the process proceeds to step S1310 of FIG. 9.

When the input signature fails to authenticate, the control unit 1010 displays a pop-up 1414 corresponding to the authentication failure. Alternatively, when the input signature fails to authenticate, the controller 1010 may display a pop-up 1414 including retry 1414a and cancellation 1414b as well as authentication failure. When the pop-up 1414 is selected by the user, the device's signature authentication method ends.

In step S1310 of FIG. 9, the device performs a function.

The controller 1010 of the device 1000 may perform a function in response to signature authentication. For example, when signature is authenticated, the controller 1010 may purchase a product through the shopping application 1410. Also, the controller 1010 may unlock the screen of the device 1000 by using an authentication signature.

When the device 1000 performs the corresponding function, the signature authentication method of the device is terminated.

The method according to an embodiment of the present invention may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like alone or in combination. The program instructions recorded on the medium may be specially designed and configured for the present invention, or may be known and usable to those skilled in computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic media such as floptical disks. -A hardware device specially configured to store and execute program instructions such as magneto-optical media, and ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine language codes such as those produced by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

100: signature registration device 110: input unit
120: registration control unit 130: detection unit
140: storage unit 150: signature authentication device
160: input unit 170: authentication control unit
180: sensing unit 190: storage unit
310: user's hand 320: mobile device
330: pitch of the mobile device 1000: device
1001: input pen 1020: control unit
1050: communication unit 1100: wearable device
1110: control unit 1130: communication unit
1150: detection unit

Claims (27)

In the signature registration device,
An input unit for receiving a signature;
A detector for detecting a state of the signature registration device;
A storage unit;
While the signature is input through the input unit, a control unit for controlling information on a state of the signature registration device sensed through the detection unit and information on the input signature to be stored in the storage unit,
And the state of the signature registration device includes one of a fixed state and a grip state, and the sensing unit includes a sensor that detects at least one of a tilt and an acceleration of the signature registration device. delete The method of claim 1,
When the detected inclination of the signature registration device is within a predetermined range, the control unit determines the state of the signature registration device as a fixed state. The method of claim 1,
When the detected acceleration of the signature registration device fluctuates within a predetermined range, the control unit determines the state of the signature registration device as a fixed state. In the signature registration method in the signature registration device,
Receiving a signature;
Determining a state of the signature registration device detected by a sensor that detects at least one of a tilt and acceleration of the signature registration device while the signature is being input;
And storing information on a state of the signature registration device and information on the inputted signature,
The method of claim 1, wherein the state of the signature registration device includes one of a fixed state and a gripped state. delete The method of claim 5,
The step of determining the state of the signature registration device
When the detected slope of the signature registration device is within a predetermined range, the state of the signature registration device to which the signature is input is determined as a fixed state,
And when the detected acceleration of the signature registration device fluctuates within a predetermined range, determining the signature registration device to which the signature is input as a fixed state. In the signature authentication device,
An input unit for receiving a user's signature;
A sensing unit that detects a state of the signature authentication device while the signature is input through the input unit;
In case of registering a signature, a storage unit for storing information on a previously stored registered signature and a state of the device;
The input signature is performed using information on the state of the device and the registered signature previously stored in the storage unit, the signature input through the input unit, and information on the state of the signature authentication device detected by the detection unit. It includes a control unit to authenticate,
When the signature is registered, the device state includes one of a fixed state and a gripped state, and the state of the signature authentication device includes one of a fixed state and a gripped state,
And the sensing unit includes a sensor for detecting at least one of a tilt and acceleration of the signature authentication device. delete The method of claim 8,
When the detected slope of the signature authentication device is within a predetermined range, the control unit determines the signature authentication device to which the signature is input as a fixed state, and the detected acceleration of the signature authentication device fluctuates within a predetermined range. If so, the signature authentication device to which the signature is input is determined to be in a fixed state. The method of claim 8,
When the state of the device in the case of registering the signature and the state of the signature authentication device are different, the control unit changes a weight for each feature used to calculate a matching degree between the previously stored registered signature and the input signature. Device. The method of claim 8,
And when the state of the device in the case of registering the signature and the state of the signature authentication device are different, the control unit changes an authentication success threshold value used for authentication of the input signature. The method of claim 8,
And when the device state in the case of registering the signature and the state of the signature authentication device are in a grip state, the control unit downwardly changes an authentication success threshold value used for authentication of the input signature. In the signature authentication method in a signature authentication device,
Receiving a user's signature;
Determining a state of the signature authentication device to which the signature is input by a sensor that detects at least one of a slope and an acceleration of the signature authentication device;
In the case of registering a signature, using information on a pre-registered signature and device status, and information on the input signature and status of the signature authentication device, authenticating the input signature,
The device state in the case of registering the signature includes one of a fixed state and a gripped state, and the state of the signature authentication device includes one of a fixed state and a gripped state. delete The method of claim 14,
The step of determining the state of the signature authentication device
When the determined slope of the signature authentication device is within a predetermined range, the state of the signature authentication device to which the signature is input is determined as a fixed state,
And when the determined acceleration of the signature authentication device varies within a predetermined range, determining the signature authentication device to which the signature is input as a fixed state. The method of claim 14,
The step of authenticating,
In response to a comparison of the state of the device and the state of the signature authentication device in the case of registering the signature, changing a weight for each feature used to calculate a matching degree between the previously registered signature and the input signature. . The method of claim 14,
The step of authenticating
And changing an authentication success threshold value used for authenticating the input signature in response to a comparison of the state of the device and the state of the signature authentication device in the case of registering the signature. A computer-readable recording medium in which a program for implementing the signature authentication method of any one of claims 14 and 16 to 18 is recorded. In the signature authentication device,
An input unit for receiving a user's signature;
A storage unit for storing information on a pre-stored registration signature and a user state;
A communication unit for receiving information on a user state from the wearable device;
Authenticating the inputted signature using information on the registered signature and the user status previously stored in the storage unit, the signature input through the input unit, and information on the user status received from the wearable device through the communication unit Device, characterized in that it comprises a control unit. The method of claim 20,
The device according to claim 1, wherein the user state received from the wearable device includes hand shaking, user shaking, user motion, walking, jogging, or drinking. The method of claim 20,
When the user state in the case of registering a signature and the user state in the case of authenticating the signature are different, the control unit changes a weight for each feature used to calculate a matching degree between the previously stored registered signature and the input signature. Device. The method of claim 20,
And when the user state in the case of registering a signature and the user state in the case of authenticating the signature are different, the control unit changes an authentication success threshold value used for authentication of the input signature. In the signature authentication device,
An input unit for receiving a user's signature;
A sensing unit that detects a state of the signature authentication device while the signature is input through the input unit;
A storage unit for storing pre-stored registration signature, information on a user state, and information on a device state;
A communication unit for receiving information on a user state from the wearable device;
A registration signature previously stored in the storage unit, information on the user state and information on the device state, a signature input through the input unit, information on the user state received from the wearable device through the communication unit, and the detection And a control unit for authenticating the input signature using information on a device state received from a unit. The method of claim 24,
The user state received from the wearable device includes hand shaking, user shaking, user motion, walking, jogging, or drinking.
The device according to claim 1, wherein the state of the device received by the sensing unit includes one of a fixed state and a grip state. The method of claim 24,
When the user state and the device state in the case of signature registration and the user state and the device state in the case of signature authentication are different, the control unit is used to calculate a matching degree between the previously stored registered signature and the input signature. Device, characterized in that to change the weight of each. The method of claim 24,
When the user state and the device state in the case of signature registration and the user state and the device state in the case of signature authentication are different, the control unit changes the authentication success threshold value used for authentication of the input signature to be decreased. Device characterized in that.

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