TWI866705B - Button group set via nfc - Google Patents

Abstract

A button group set via NFC is disclosed. It includes: a plurality of physical buttons; a near field communication antenna module that receives an authorization signal and an execution command from a near field communication reader, converts the electromagnetic energy emitted from the near field communication reader into electricity for its own operation, and performs an authentication operation on the authorization signal; and a processor, respectively signally connected with the physical buttons and the near field communication antenna module, executing the execution command after the authentication operation is successful. The execution command activates at least one of the physical buttons and sets an action corresponding to the activated physical button in the processor. When any activated physical button is pressed, the processor executes the corresponding action.

Description

Keyboard set via NFC

The present invention relates to a key set, in particular a key set that can set functions and usage permissions via NFC.

Keys have been used as input devices for hardware communication for many years. A key can conduct a set of circuits to execute or cancel an instruction. If too many keys are required to operate a mechanical device, the microprocessor inside it will need multiple input and output terminals to accept the input of the keys, which will increase the cost. If these keys can use a hardware communication IO protocol, then all key output and input pins can be replaced, reducing manufacturing costs and the complexity of printed circuit boards. Currently, the control panels of home appliances, machine tools, and production machinery and equipment all use traditional keys or membrane key switches. These switches themselves are not designed with permission management. At most, they require inputting a PIN code for control, or provide traditional mechanical locks such as case locks, panel locks, and switch locks to allow specific personnel to operate buttons. This has led to some malpractices. For example, when an equipment engineer is performing maintenance, an operator is watching and memorizing the PIN code so that the operator can perform maintenance privately; when the equipment manufacturer is performing maintenance, the customer secretly learns and memorizes the password, and then the customer will perform maintenance on his own, or ask a locksmith to open the lock, or the equipment manufacturer's former employees will take orders privately, resulting in significant losses in maintenance orders for the equipment manufacturer.

More specifically, when factories produce and test equipment, they need to strictly manage the processes of power on, power off, standby, production parameter adjustment and setting, etc. However, the buttons on the machine control panel are not authorized to be controlled. At most, there is a switch mechanical lock. Operators often touch it by mistake or perform unauthorized operations, causing losses to the factory. Home appliances usually do not have power on and off authority management, causing community public equipment such as vacuum cleaners to be taken privately by residents and even easily stolen. If there is authority control, residents cannot use it even if they take it privately. The cash box in some chain convenience stores' POS machines has been changed to a password unlocking in a computer program, which can be easily known by colleagues or guests, causing security risks, and it is impossible to know who opened the lock.

On the other hand, many instruments, machines, and home appliances cannot be connected to the Internet or set up access control due to limited functions or limited locations. It is often difficult to find the last user or the last person to modify the settings, or it is difficult to find the relevant person. It is often necessary to check the monitor, production log, and machine records to trace back. At the same time, users cannot understand whether the machine or equipment is turned on or off on time, and can only handle it through on-site inspections.

In order to solve the current problems in key usage, the present invention is proposed to provide key group usage permissions and even function setting operations.

This paragraph extracts and compiles certain features of the invention. Other features will be revealed in subsequent paragraphs. Its purpose is to cover various modifications and similar arrangements within the spirit and scope of the attached patent application.

The present invention proposes a key set configured via NFC, which comprises: a plurality of physical keys; a near field communication antenna module, which receives an authorization signal and an execution command from a near field communication reader, converts the electromagnetic energy from the near field communication reader into electricity for its own operation, and performs an authentication operation on the authorization signal; and a processor, which is respectively connected to the physical keys and the near field communication antenna module signal, and executes the execution command after the authentication operation is successful. The execution instruction activates at least one of the physical keys and sets an action corresponding to the activated physical key in the processor; when any activated physical key is pressed, the processor executes the corresponding action.

The present invention also proposes another key set set through NFC, which includes: a plurality of physical keys; a near field communication antenna module, which receives an authorization signal and an execution command from a near field communication reader, converts the electromagnetic energy from the near field communication reader into electricity for its own operation, and performs an authentication operation on the authorization signal; and a processor, which is respectively connected to the physical keys and the near field communication antenna module signal, and executes the execution command after the authentication operation is successful. Each physical key is preset with an action; the execution command activates at least one of the physical keys; when any activated physical key is pressed, the processor executes the corresponding action.

According to the present invention, the NFC antenna module can notify the NFC reader after the authentication operation is successful, and the NFC reader will issue the execution command.

Preferably, the signal connection between the near field communication antenna module and the processor complies with the general-purpose input/output (GPIO) specification, the universal asynchronous receiver/transmitter (UART) specification, the integrated circuit bus (I ² C) specification, or the serial peripheral interface (SPI) specification, and the signal connection between the physical keys and the processor also complies with the GPIO specification, the UART specification, the I ² C specification, or the SPI specification.

Preferably, the physical key is a capacitive film key, a resistive film key, a mechanical key, or a combination of the aforementioned keys.

According to the present invention, the near field communication reader is installed in a mobile communication device, and an application is installed in the mobile communication device. After the application is executed, a control interface is displayed on the screen of the mobile communication device, and the control interface is used to set the content of the execution command.

According to the present invention, a plurality of virtual keys can be further displayed on the control interface, each virtual key corresponds to an activated physical key, and when any virtual key is touched, the near field communication reader sends a signal to the processor through the near field communication antenna module that the activated physical key corresponding to the touched virtual key has been pressed, so that the processor executes the corresponding action.

According to the present invention, the processor can transmit a feedback message of executing the action to the near-field communication reader through the near-field communication antenna module and display it on the control interface.

According to the present invention, after the authentication process is completed, the application further sends the result of the success or failure of the authentication process in the form of a message to a preset specific IP location via the mobile communication device.

Preferably, the authorization signal and the execution command comply with the ISO14443 communication protocol.

The near-field communication antenna module may further include: a near-field communication antenna unit, which transmits and receives signals with the near-field communication reader and converts the electromagnetic energy emitted by the near-field communication reader into electricity; and a processing unit, which is signal-connected to the near-field communication antenna unit, receives the electricity of the near-field communication antenna unit to perform the authentication operation, and is signal-connected to the processor to transmit and receive signals.

Preferably, the data transmitted between the processor and the NFC reader is encrypted by the sender using the Data Encryption Standard (DES), Triple Data Encryption Algorithm (3DES) or Advanced Encryption Standard (AES), and decrypted by the receiver.

The authentication operation may include the following steps: a) taking out a verification code pre-stored in the processing unit; and b) comparing the decryption code with the verification code, if the two are the same, the authentication is successful. The authentication operation may also include the following steps: c) if the decryption code is a ciphertext obtained by encrypting a first plaintext using a symmetric key, taking out a second plaintext and the symmetric key pre-stored in the processing unit; and d) decrypting the ciphertext with the symmetric key, if the decryption result is that the second plaintext is the same as the first plaintext, the authentication is successful. The authentication operation may further include the following steps: e) the processing unit generates a first random number, and transmits the first random number and a near field communication chip serial number of the processing unit to the near field communication reader; f) the near field communication reader transmits the first random number and the near field communication chip serial number to a public key infrastructure platform, and the public key infrastructure platform uses A public key in a pair of keys generated by the NFC chip serial number is used to digitally sign the first random number to obtain the unlocking code; g) the processing unit uses a private key in the pair of keys stored to digitally verify the unlocking code to obtain a second random number; and h) compares the second random number with the first random number. If the two are the same, the authentication is successful.

The physical key of the present invention is activated or enabled only after the authorized authentication operation is successful, which can effectively manage users and only allow authorized users to unlock and operate the physical key with their NFC reader. Due to the convenient design and installation, the device equipped with the key set set by NFC of the present invention can effectively solve the problems faced by the above-mentioned known technology.

1: Near Field Communication Reader

2: Mobile communication devices

3: Screen

4: Control interface

5: Virtual keys

6: Feedback message column

10: Physical buttons

11: Signal bus cable

20: Near field communication antenna module

21: Near field communication antenna unit

22: Processing unit

22a: Near Field Communication Chip

22b: Random Access Memory

22c: Read-only memory

22d: Input and output interface

30: Processor

Figure 1 is a schematic diagram of the components and operating environment of a key set set via NFC according to an embodiment of the present invention.

Figure 2 is a schematic diagram of the components of a near field communication antenna module.

FIG3 shows how a physical button is activated via a control interface displayed on a screen of a mobile communication device.

FIG4 shows the virtual button displayed on the control interface of the mobile communication device when it is touched.

FIG5 shows how to set the physical buttons through the control interface displayed on the screen of the mobile communication device.

The present invention will be described in more detail with reference to the following embodiments.

Please see Figure 1, which is a schematic diagram of the components and operating environment of a key set set via NFC according to an embodiment of the present invention. The key set set via NFC includes a plurality of physical keys 10, a near field communication antenna module 20 and a processor 30, which are described in detail below.

The key set configured via NFC is a part of many devices, such as instruments, production machines, home appliances, etc., regarding the hardware for input control. Installed in these devices, the key set configured via NFC can be highly customized. The physical key 10 is hardware for the operator to control. In terms of form, the state of the physical key is not limited, and it can be a commonly used capacitive film key, a resistive film key, a mechanical key, or a mixture of the aforementioned keys. In this embodiment, a capacitive film key is used as an example to illustrate. Each physical key 10 has an independent function, and when pressed, a key signal is sent through the signal bus 11 to the processor 30 connected by the signal bus 11. The key signal can represent input text, numbers and symbols. For example, when the physical keys 10 of "7", "+" and "A" in FIG. 1 are pressed, "7", "+" and "A" can be input to the processor 30 respectively. The key signal can also represent the activation of a specific function. For example, when the physical keys 10 of "reset" and "left arrow" in FIG. 1 are pressed, the functions of "reset the system" and "move the cursor one grid to the left" can be respectively issued to the processor 30. According to the present invention, the signal bus 11, which is a device for signal connection between the physical key 10 and the processor 30, represents the signal connection between the two, and can comply with the general-purpose input/output (GPIO) specification, the universal asynchronous receiver/transmitter (UART) specification, the integrated circuit (I ² C) specification, or the serial peripheral interface (SPI) specification. The signal bus between the near field communication antenna module and the processor can output the power converted by the near field communication antenna module.

The NFC antenna module 20 can communicate wirelessly with a NFC reader 1 based on NFC technology. The NFC reader 1 can actively send out signals to seek a response from the NFC antenna module 20, and also includes obtaining data stored in the NFC antenna module 20. In this embodiment, the NFC reader 1 is installed in a mobile communication device 2. The mobile communication device 2 can be a smart phone, a tablet computer, a notebook computer or a smart wearable device. The NFC reader 1 is installed in the mobile communication device 2 as an independent module (because it cannot be seen by the mobile communication device 2, the NFC reader 1 is marked with dotted lines). In this embodiment, the NFC antenna module 20 can receive an authorization signal and an execution command from the NFC reader 1, and convert the electromagnetic energy from the NFC reader 1 into electricity for its own operation. In addition, the NFC antenna module 20 can also perform an authentication operation on the authorization signal. The execution command can be set by adjusting the potential of the output and input terminals of the NFC reader 1, and in this embodiment, it can be processed by the mobile communication device 2. To achieve this purpose, an application can be installed in the mobile communication device 2. After the application is executed, a control interface can be displayed on the screen 3 of the mobile communication device 2, and the control interface can be used to set the content of the execution command. The control interface will be described in detail later.

Please see FIG. 2, which is a schematic diagram of the components of the NFC antenna module 20. The NFC antenna module 20 includes a NFC antenna unit 21 and a processing unit 22. The NFC antenna unit 21 transmits and receives signals with the NFC reader 1, and converts the electromagnetic energy from the NFC reader 1 into electricity, which is used for its own operation and also allows the processing unit 22 to operate. The authorization signal and the execution command are electromagnetic wave signals, which can transmit the authorization information and the content of the specific execution operation respectively by continuous transmission or packet transmission. The processing unit 22 is signal-connected to the NFC antenna unit 21, receives power from the NFC antenna unit 21 to perform the authentication operation, and is signal-connected to the processor 30 via the signal bus 11 to perform signal transmission and reception. The processing unit 22 includes a NFC chip 22a, a random access memory 22b, a read-only memory 22c, and an input/output interface 22d. The NFC chip 22a is used to process the received signal, and in particular, can be programmed to randomly generate a random number and process the unlock code in the authorization signal. The relevant program code is stored in the read-only memory 22c, and the data generated when the NFC chip 22a is in operation can be temporarily stored in the random access memory 22b. The input/output interface 22d is a device for the processing unit 30 and the NFC antenna module 20 to communicate information through the signal bus 11. Therefore, the signal connection between the NFC antenna module 20 and the processor 20 also meets the requirements of the GPIO specification, the UART specification, the I ² C specification, or the SPI specification. In addition, the signal bus cable 11 between the NFC antenna module 20 and the processor 30 can also output the power converted by the NFC antenna module 20. Considering the information security requirements, the data transmitted between the processor 30 and the NFC reader 20 is encrypted by the sender using the Data Encryption Standard (DES), Triple Data Encryption Algorithm (3DES) or Advanced Encryption Standard (AES), and is decrypted by the receiver. At the same time, the authorization signal and the execution command can be wirelessly transmitted in accordance with a specific communication protocol, such as the ISO14443 communication protocol.

The aforementioned authentication operation belongs to an authorization scheme. After the authentication operation is successful, the manufacturer or system operator of the key set set through NFC allows the user holding the mobile communication device 2 (near field communication reader 1) to operate the physical keys 10 to control the processor 30, and then control the equipment connected to and controlled by the processor 30. The authentication operation can be very simple and include the following steps. The first step: take out a verification code pre-stored in the processing unit 22 (S01). Then, the second step is to compare the unlocking code and the verification code with the processing unit 22. If the two are the same, the authentication is successful (S02). The verification code can also be encrypted, and the authentication operation includes the following steps. Step 1: If the unlocking code is a ciphertext obtained by encrypting a first plaintext using a symmetric key, take out a second plaintext and the symmetric key pre-stored in the processing unit 22 (S11). Next, step 2: decrypt the ciphertext using the symmetric key. If the decrypted result is that the second plaintext is the same as the first plaintext, the authentication is successful (S12). The above authentication operation is one-way, that is, after being executed at the processing unit 22, whether the authentication is successful or not can be determined. The authentication operation can also be two-way, and the authentication operation then includes the following steps. Step 1: The processing unit 22 generates a first random number, and transmits the first random number and a near-field communication chip serial number of the processing unit 22 to the near-field communication reader 1 (S21). Then, the second step: the NFC reader 1 transmits the first random number and the NFC chip serial number to a public key infrastructure platform, and the public key infrastructure platform uses a public key in a pair of keys generated by the NFC chip serial number to digitally sign the first random number to obtain the unlock code (S22). The public key infrastructure platform is a cloud infrastructure composed of hardware, software, participants, management policies and processes, and its purpose is to create, manage, distribute, use, store and restore digital certificates. The public key infrastructure platform links the user's personal identity with the public key through a digital certificate authentication agency. In the application of the present invention, the personal identity is the NFC chip serial number, which is unique. The link relationship is established through the registration and publishing process, which can be completed by various software of the digital certificate authentication agency or under human supervision. The algorithm for generating the pair of keys is an asymmetric key algorithm, and the commonly used algorithms are RSA algorithm, digital signature algorithm and elliptical curve cryptographic algorithm, which are not limited by the present invention. After step S22, the unlocking code is generated. Then, the third step: the processing unit 22 uses a private key in the stored pair of keys to digitally verify the unlocking code to obtain a second random number (S23). Finally, the fourth step: compare the second random number with the first random number. If the two are the same, the authentication is successful (S24). When the NFC antenna module 20 passes the authentication operation, the processor 30 can take the initiative to execute the execution command. After the authentication operation is successful, the NFC antenna module 20 notifies the NFC reader 1, and the NFC reader 1 issues the execution command, which is then executed by the processor 30.

The processor 30 is different from the aforementioned processing unit 22. The former is the main control component in the controlled device, while the latter is only the control chip (group) in the near-field communication antenna module 20. In addition to executing the execution instructions from the near-field communication antenna module 20, the former is also responsible for the overall operation of the installed device, while the latter is only responsible for sending and receiving messages with the near-field communication reader 1 and performing authentication operations. Therefore, the present invention requires customized processing according to different types of processors 30 for different devices. In terms of form, the processor 30 is respectively connected to the physical keys 10 and the near-field communication antenna module 20 through the signal bus cable 11, and executes the execution instruction after the authentication operation is successful. In the present embodiment, each physical key 10 is preset with an action, and the aforementioned execution instruction is to activate at least one of the physical keys 10. When any activated physical key 10 is pressed, the processor 30 executes the corresponding action. Please refer to FIG. 1 again, the physical key 10 can be roughly divided into a number symbol area on the left half and a function area on the right half. In the present embodiment, the physical key 10 in the number symbol area can be operated by anyone, and its action is to output the number or symbol displayed on the physical key 10. The physical key 10 in the function area has no use before the authentication operation is successful, and the function displayed on the key cap is turned on only after the authentication operation is successful. In other words, the unlock code, ciphertext or private key in the NFC reader 1 held by the user represents a certain identity authorization, and can use the physical key 10 in the "banned" function area. Different unlock codes, ciphertexts or private keys can also further unlock the physical keys 10 in the function area in batches.

According to the present invention, after the authentication operation is passed, in addition to being able to fully operate all physical keys 10, they can also be operated through the mobile communication device 2. Please see Figure 3, which shows the state of activating the physical keys 10 through a control interface 4 displayed on the screen 3 of the mobile communication device 2. The control interface 4 displays a plurality of virtual keys 5 at the top and a feedback message bar 6 at the bottom. The number and layout of the virtual keys 5 and the physical keys 10 are the same, and each virtual key 5 corresponds to an activated physical key 10 (including the physical keys 10 in the default activatable numeric symbol area and the physical keys 10 in the function area activated after the authentication operation is successful). When any virtual key 5, such as the "Insert" key in FIG. 3 , is touched, the NFC reader 1 sends a signal to the processor 30 through the NFC antenna module 20 that the activated physical key 10 corresponding to the touched virtual key 5 is pressed, so that the processor executes the corresponding action, such as commanding the device to "insert" the currently detected data into the execution sequence. If the physical key 10 in the operation authorization function area needs to be listed and notified to the responsible party, such as a maintenance worker is authorized to operate the physical key 10 in the function area to repair the device, then after the authentication operation is completed, the application can send the result of the success or failure of the authentication operation in the form of a message to a preset specific IP location through the mobile communication device 2. The owner of these IP location-locked hardware can immediately know whether the physical button 10 on the ribbon is unlocked and monitor the subsequent operation of the device.

When the processor 30 executes the function of the activated physical key 10 corresponding to the virtual key 5, the result of the execution of the action or the notification of the execution of the action can be presented on the screen 3 through a feedback message. That is, the processor 30 transmits the feedback message of the execution of the action to the near field communication reader 1 through the near field communication antenna module 20, and the near field communication reader 1 transmits it to the central processor of the mobile communication device 2, and displays it on the control interface 4 of the screen 3. Please see Figure 4, which shows the state of the virtual key 5 displayed on the control interface 4 of the mobile communication device 2 when it is touched. It can be seen from the feedback message in the feedback message column 6 of FIG4 that the user touches the "0", "0", "Copy" and "A" keys on the virtual key 5 in sequence, and the processor 30 executes the relevant triggering actions.

In the previous embodiment, each physical key 10 is preset with an action, and when any activated physical key 10 is pressed, the processor 30 executes the corresponding action. However, according to the present invention, the physical key 10 can have a preset action, and the actual function of each physical key 10 is specified by the user. See FIG5, which shows the state of setting the physical key 10 through the control interface 4 displayed on the screen 3 of the mobile communication device 2. The execution command can activate at least one of the physical keys 10 and set an action corresponding to the activated physical key 10 in the processor 30. For example, when the user touches the "Delete" virtual button 5, a drop-down menu will appear in the function setting bar 7 below the control interface 4, allowing the user to select one of the many settings to set the function of the "Delete" virtual button 5.

Although the present invention has been disclosed in the form of implementation as above, it is not intended to limit the present invention. Anyone with ordinary knowledge in the relevant technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of the patent application attached hereto.

1: Near Field Communication Reader

2: Mobile communication devices

3: Screen

10: Physical buttons

11: Signal bus cable

20: Near field communication antenna module

30: Processor

Claims (16)

A key set configured via NFC includes: a plurality of physical keys; a near field communication antenna module, receiving an authorization signal and an execution command from a near field communication reader, converting the electromagnetic energy from the near field communication reader into electricity for its own operation, and performing an authentication operation on the authorization signal; and a processor, respectively connected to the physical keys and the near field communication antenna module signal, and executing the execution command after the authentication operation is successful, wherein the execution command activates at least one of the physical keys, and sets an action corresponding to the activated physical key in the processor; when any activated physical key is pressed, the processor executes the corresponding action. A key set configured via NFC includes: a plurality of physical keys; a near field communication antenna module, receiving an authorization signal and an execution command from a near field communication reader, converting the electromagnetic energy from the near field communication reader into electricity for its own operation, and performing an authentication operation on the authorization signal; and a processor, respectively connected to the physical keys and the near field communication antenna module signal, and executing the execution command after the authentication operation is successful, wherein each physical key is preset with an action; the execution command activates at least one of the physical keys; when any activated physical key is pressed, the processor executes the corresponding action. A key set configured via NFC as described in claim 1 or 2, wherein the NFC antenna module notifies the NFC reader after the authentication operation is successful, and the NFC reader issues the execution command. A key set configured via NFC as described in claim 1 or 2, wherein the signal connection between the near-field communication antenna module and the processor complies with the general-purpose input/output (GPIO) specification, the universal asynchronous receiver/transmitter (UART) specification, the integrated circuit bus (I ² C) specification, or the serial peripheral interface (SPI) specification, and the signal bus line between the near-field communication antenna module and the processor can output the power converted by the near-field communication antenna module. A key set configured via NFC as described in claim 1 or 2, wherein the signal connection between the physical keys and the processor complies with the GPIO specification, the UART specification, the I ² C specification, or the SPI specification. A key set configured via NFC as described in claim 1 or 2, wherein the physical key is a capacitive film key, a resistive film key, a mechanical key, or a combination of the aforementioned keys. A key set configured via NFC as described in claim 1 or 2, wherein the near field communication reader is installed in a mobile communication device, an application is installed in the mobile communication device, and after the application is executed, a control interface is displayed on the screen of the mobile communication device, and the control interface is used to set the content of the execution command. As described in claim 7, a key set set via NFC, wherein a plurality of virtual keys are further displayed on the control interface, each virtual key corresponds to an activated physical key, and when any virtual key is touched, the near field communication reader sends a signal to the processor via the near field communication antenna module indicating that the activated physical key corresponding to the touched virtual key has been pressed, so that the processor executes the corresponding action. A key set configured via NFC as described in claim 7, wherein the processor transmits a feedback message of executing the action to the NFC reader via the NFC antenna module and displays it on the control interface. A key set configured via NFC as described in claim 7, wherein after the authentication operation is completed, the application further sends the result of the success or failure of the authentication operation in the form of a message to a preset specific IP location via the mobile communication device. A key set configured via NFC as described in claim 1 or 2, wherein the authorization signal and the execution command comply with the ISO14443 communication protocol. A key set configured via NFC as described in claim 1 or 2, wherein the near-field communication antenna module further comprises: a near-field communication antenna unit, which transmits and receives signals with the near-field communication reader and converts electromagnetic energy emitted by the near-field communication reader into electricity; and a processing unit, which is signal-connected to the near-field communication antenna unit, receives the electricity of the near-field communication antenna unit to perform the authentication operation, and is signal-connected to the processor to transmit and receive signals. A key set configured via NFC as described in claim 1 or 2, wherein the data transmitted between the processor and the near field communication reader is encrypted by the sender using the Data Encryption Standard (DES), Triple Data Encryption Algorithm (3DES) or Advanced Encryption Standard (AES), and is decrypted by the receiver. A key set configured via NFC as described in claim 12, wherein the authentication operation includes the following steps: a) retrieving a verification code pre-stored in the processing unit; and b) comparing a decryption code with the verification code, and if the two are the same, the authentication is successful. As described in claim 14, the key set set via NFC, wherein the authentication operation includes the following steps: c) if the decryption code is a ciphertext obtained by encrypting a first plaintext using a symmetric key, taking out a second plaintext and the symmetric key pre-stored in the processing unit; and d) decrypting the ciphertext using the symmetric key, and if the decrypted result is that the second plaintext is the same as the first plaintext, then the authentication is successful. A key set configured via NFC as described in claim 14, wherein the authentication operation comprises the following steps: e) the processing unit generates a first random number, and transmits the first random number and a near field communication chip serial number of the processing unit to the near field communication reader; f) the near field communication reader transmits the first random number and the near field communication chip serial number to a public key infrastructure platform, the The public key infrastructure platform uses a public key in a pair of keys generated by the NFC chip serial number to digitally sign the first random number to obtain the unlocking code; g) the processing unit uses a private key in the stored pair of keys to digitally verify the unlocking code to obtain a second random number; and h) compares the second random number with the first random number. If the two are the same, the authentication is successful.