KR100561488B1 - Security system having a security camera with a built-in encryption circuit and encryption key setting method of the system - Google Patents

Abstract

The present invention relates to a security camera system, and in detail, it is possible to determine whether the video signal and the audio signal of the camera is modulated, and a method for setting an encryption key used for encrypting to prevent playback even if leaked. The present invention relates to a security system having a camera with a built-in circuit for encrypting using a set encryption key.

It is an object of the present invention to provide a security system having a security camera with a built-in encryption circuit that can be installed only by an authorized administrator when installing a camera storing a camera number for encryption in a security system. In addition, another object of the present invention is to provide a security system having a camera with a built-in encryption circuit for transmitting the encrypted data from the camera to the receiving device in response to a request signal from the receiving device when the encryption key is set.

Security system, security camera, DVR, encryption key data

Description

SECURITY SYSTEM HAVING THE SECURITY CAMERA WITH ENCRYPTION CIRCUIT AND SETTING UP METHOD OF PASSWORD KEY SAID SYSTEM}

1 is a schematic block diagram of a security system having a security camera according to an embodiment of the present invention;

FIG. 2 is a flowchart for describing an encryption key setting operation of a microprocessor of the receiving device of FIG. 1. FIG.

3 is a flowchart for describing an encryption key setting operation of a controller of the camera of FIG. 1.

4 is a schematic block diagram of a conventional security system

<Description of Symbols for Main Parts of Drawings>

100 camera 110 CCD

120 DSP 130 control unit

140 Encryption unit 150 P / S converter

160 memory means 200 transmission means

210 Serial Digital Data 300 Receiver

310 S / P Converter 320 Decoder

330 Microprocessor 360 Storage

The present invention relates to a security camera system, and in detail, it is possible to determine whether the video signal and the audio signal of the camera is modulated, and a method for setting an encryption key used for encrypting to prevent playback even if leaked. The present invention relates to a security system having a camera with a built-in circuit for encrypting using a set encryption key.

In general, a security system with a camera consists of a camera, a video storage device, a monitor, and a cable. The present invention uses a digital video recorder (hereinafter referred to as a "DVR") that has improved functions such as image quality, recording time, and image search.

4 is a schematic configuration diagram of a security system having a camera with a built-in encryption circuit filed and filed in 2002 (No. 10-372760) filed by the applicant of the present invention to capture a plurality of video signals corresponding to an image. Converting the digital video signal into a usable digital image signal, encrypting the image signal, and transmitting the same to a transmission means to be described later, the transmission means 20 through which the encrypted digital image signal is transmitted, and the transmission means 20. A receiving device 30 which decodes the encrypted digital video signal and outputs it to an external monitor 50 or stores it in the storage device 35 and from the receiving device when the encrypted digital video data is modulated. It is configured to include an alarm device 40 for receiving an alarm signal to inform the outside.

The security system having a camera with the encryption circuit as described above transmits the image data obtained from the CCD 11 and the image signal encrypted with the encryption key generated using the camera number 15 assigned at the time of camera production. In addition, the decryption unit 32 of the reception device 30 also decrypts and displays or stores the encrypted video signal using an encryption key set during system configuration.

In the conventional security system having a camera with a built-in encryption circuit, a mutual system authentication process of the camera 10 and the receiving device 30 is required to construct a system that can be used only by an authenticated user. To this end, a method of setting and confirming an encryption key between a camera and a receiving device is required.

The present invention is to provide a method for setting a cryptographic key generated using a unique camera number of the camera in the security system as described above and a method for operating the system.

Accordingly, another object of the present invention is to provide a security system having a camera with a built-in encryption circuit for transmitting encryption key data to a receiving device in response to a request signal from the receiving device.

Security system having a security camera with a built-in encryption circuit of the present invention for achieving the above object is a CCD and a digital signal processor, and receives a digital image signal from the digital signal processor is given unique in the camera production A plurality of security cameras including encryption logic for encrypting using an encryption key generated by inputting a serial number which is a value, a decryption logic for receiving an encrypted signal transmitted from the camera and decrypting it; A security system comprising a receiving device including a microprocessor for outputting an image signal to a monitor, wherein the camera further comprises a memory means for storing whether an encryption key is set, and a control unit. Whether or not to transmit the encryption key, and storing means for storing the transmitted encryption key value. And the microprocessor of the receiving device authenticates a user through an interface of a system application to determine whether an encryption key setting signal is input from the authenticated user, and when the encryption key setting signal is input, requesting an encryption key from the camera. Outputs a signal and stores the encryption key when the encryption key is transmitted from the camera and transmits the encryption key reception completion signal to the camera, and the controller of the camera determines whether the encryption key is set using the memory means, and if not, receives the encryption key. It is determined whether an encryption key request signal is input from the device, and when it is input, an encryption key is generated using a serial number, and the image signal is encrypted using the generated encryption key and transmitted to a receiving device, and the encryption key is received from the receiving device. When the signal is received it is characterized in that for storing.

In addition, in the security system having a security camera with a built-in encryption circuit of the present invention, the microprocessor of the receiving device receives an encrypted video signal with an encryption key from the camera when the encryption key setting signal is not input and is stored. Comparing the key and the encryption key of the encrypted video signal, if the video signal is matched, and if it does not match, an error message is displayed.

On the other hand, the encryption key setting method of the security system having a security camera with a built-in encryption circuit of the present invention is a unique value given at the time of production of the camera receives a digital video signal from the CCD and the digital signal processor, and the digital signal processor A plurality of security cameras comprising encryption means for encrypting using an encryption key generated by inputting a serial number, a decryption means for receiving an encrypted signal transmitted from the camera and decrypting it, and the decrypted image. A method for setting an encryption key of a receiving device in a security system including a receiving device including a microprocessor for outputting a signal to a monitor, the method comprising: an authentication step of authenticating an externally connected user; Judging whether a signal to be set is input; An encryption key request step of requesting an encryption key of the camera when an encryption key setting signal is input, an encryption key decryption step of extracting an encryption key by receiving an image signal encrypted with the encryption key from the camera, and storing the extracted encryption key And transmitting an encryption key setting completion signal to the camera to terminate the encryption key setting.

In addition, the encryption key setting method of the security system having a security camera with a built-in encryption circuit is encrypted from the camera when there is no encryption key setting signal in the step of determining whether a signal to set the encryption key of the camera is inputted The method further includes an encryption key error step of outputting a warning message if the encryption key of the video signal is compared with the previously stored encryption key.

On the other hand, a plurality of encryption means including a CCD and a digital signal processor, and encryption means for receiving a digital image signal from the digital signal processor and encrypting it using an encryption key generated by inputting a serial number which is a unique value given at the time of camera production. Security cameras, a receiving device including a microprocessor for receiving an encrypted signal transmitted from the camera and decrypting the encrypted signal, and a microprocessor for outputting the decrypted video signal to a monitor. An encryption key setting method comprising: an encryption key setting determination step of determining whether an encryption key is set; an encryption key request signal checking step of determining whether an encryption key request signal is input from a receiving device if the encryption key is not set; If the encryption key request signal is input in the encryption key request signal confirmation step, an encryption key is generated. And, receiving the encrypted video signals key generated password receiving the transmission step, a signal has completed the setting of the encryption key from the receiving device to transmit to a receiving device characterized by comprising the encryption key setting confirmation step of storing them.

As described above, the security system to which the present technology is applied stores the encryption key in the camera and the receiving device, respectively, and the encryption key can be set only by an administrator. Since the encryption key cannot be set, the random use is prohibited.

Hereinafter will be described in detail a security system of a preferred embodiment of the present invention.

1 is a schematic block diagram of a security system having a security camera according to an embodiment of the present invention, Figure 2 is a flow chart for explaining the encryption key setting operation of the microprocessor of the receiving device of Figure 1, FIG. 3 is a flowchart for describing an encryption key setting operation of the camera controller of FIG. 1.

First, referring to FIG. 1, a plurality of video signals corresponding to an image are photographed, converted into usable digital video signals, encrypted and transmitted to a transmission means to be described later, and the encrypted digital video signals are transmitted. The transmission means 200 and the reception device 300 for decoding the encrypted digital video signal transmitted through the transmission means 200 and outputting the decoded digital video signal to an external monitor 500 or storing it in the storage device 350. And, when the encrypted digital image data is modulated, it comprises an alarm device 400 for receiving an alarm signal from the receiving device to inform the outside.

The camera 100 is installed in a plurality of security zones, and the video signal photographed at the same time from the plurality of cameras 100 is transmitted to the receiving device 300 and stored.

The camera 100 includes a charge coupled device (110), a digital signal processor (DSP) 120, a controller 130, a memory means 160, an encryption unit 140, and a P / S converter. (parallel to serial converter; 150). The CCD 110 outputs an image input through a lens as an image signal. The digital signal processor (DSP) 120 encodes the output video signal into a video format and converts the output video signal into a usable digital video signal. The encryption unit 140 is output from the DSP (digital signal processor) 120 by using an encryption key generated by the camera-specific serial number 170 that is assigned at the time of camera production so that the camera can be identified, and the controller ( Digital video signal data transmitted through 130 is encrypted. The P / S converter 140 converts the encrypted digital image data into serial data 210 and transmits the serial data 210 to the transmission means 200. The memory means 160 stores whether an encryption key is set in communication with the receiving device 300.

The receiver 300 includes an S / P converter 310, a decoder 320, a storage unit 360, a microprocessor 330, a data compressor 340, And a storage device 350. In addition, the microprocessor 330 is further provided with an external terminal 360 to output the digital video signal to the outside, the external terminal 360, the monitor 500 and an alarm device for outputting an alarm sound ( 400) The same peripheral is connected. The S / P converter 310 receives an encrypted serial digital video signal 210 from the camera 100 and converts the encrypted serial digital video signal into an encrypted parallel digital video signal. The storage means 360 stores encryption key values of the plurality of cameras 100 and whether the encryption key is set by communicating with the camera 100, and the decryption unit 320 stores the encrypted digital video signal. Is decrypted with an encryption key stored in the storage means 360, and provided to the microprocessor 330, and the microprocessor 330 maps the decrypted parallel digital image data for each scan line and outputs the same. The data compressor 340 compresses an image signal output through the microprocessor 330, and the memory device 350 stores the compressed data.

The encryption key setting operation of the microprocessor 330 of the receiving apparatus 300 will be described with reference to FIG. 2 as follows.

The microprocessor 330 of the receiver 300 authenticates a user or an administrator to access (S31). That is, only the administrator who is authorized in advance can access the receiving device 300. Thereafter, the microprocessor 300 determines whether an encryption key setting signal is input from the authenticated administrator (S12), and if so, outputs an encryption key request signal to the control unit 130 of the camera 100 (S13). Thereafter, the image / audio signal encrypted with the encryption key is received from the camera 100, the encryption key is extracted and stored, and the encryption key setting completion signal is transmitted to the controller 130 of the camera 100. When determining whether the encryption key setting signal is input (S12), if the encryption key setting signal is not input, it is determined by comparing the extracted encryption key and the encryption key stored in the storage means 360 (S18) and If a match is found, the video / audio signal is reproduced and displayed to / from the administrator or the user (S19). If not, a warning or error message is output to the monitor 400 (S20).

The encryption key setting operation of the controller 130 of the camera 100 will be described with reference to FIG. 3.

First, the controller 130 determines whether the encryption key has been previously set using the memory means 160 (S31). In this case, if the encryption key is set, the image / audio signal is encrypted by the set encryption key and output to the receiving device 300 (S32). If the encryption key is not set, the encryption from the microprocessor 330 of the receiving device 300 is performed. It is determined whether the key request signal is input (S33), the image transmission is not performed until the encryption key setting signal is received, and when the encryption key setting signal is received, the encryption key is generated using the serial number 170 (S34). ), The image / audio signal is encrypted using the generated encryption key and output to the receiving device 300 (S35). Thereafter, the control unit 130 receives the encryption key setting completion signal from the receiving device 300 and stores it in the memory means 160 (S36).

Therefore, only the authorized administrator or user can set the encryption key through the receiving device 300, so that the reliability of the encryption key is high, and even through the receiving device 300 for the camera 100 newly replaced by the administrator. You can set the encryption key.

As described above, according to the present invention, since the encryption key can be set only by an authenticated administrator or user, the copy or change of the encryption key by an external intruder is blocked at the source, so that the reliability of the security system is high.

In addition, when a camera is replaced due to a physical failure or loss of a camera, an authorized administrator or user can store the encryption key generated by the camera through the receiving device in the receiving device. This has the effect of resetting the serial number.

An embodiment of the present invention described above and illustrated in the drawings should not be construed as limiting the technical spirit of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention, as will be apparent to those skilled in the art.

Claims (5)

A plurality of security including a CCD and a digital signal processor, and encryption logic for receiving a digital image signal from the digital signal processor and encrypting it using an encryption key generated by inputting a serial number which is a unique value given at the time of camera production. A security system comprising a receiving device including a camera, a decryption logic for receiving an encrypted signal transmitted from the camera and decrypting the same, and a microprocessor for outputting the decrypted video signal to a monitor. The camera further includes a memory means for storing whether the encryption key is set, and a control unit, The receiving apparatus further includes a storage means for storing whether the encryption key transmission of the camera, and the transmitted encryption key value, The microprocessor of the receiving device authenticates a user through an interface of a system application to determine whether an encryption key setting signal is input from the authenticated user, and when the encryption key setting signal is input, outputs a signal requesting an encryption key to the camera. When the encryption key is transmitted from the camera, it is stored, and the encryption key reception completion signal is transmitted to the camera. The controller of the camera determines whether the encryption key is set using the memory means, and if it is not set, determines whether an encryption key request signal is input from the receiving device, and if so, generates an encryption key using a serial number and generates the encryption key. A security system having a security camera with a built-in encryption circuit, characterized in that the video signal is encrypted using the encryption key and transmitted to the receiving device, and receiving the encryption key reception completion signal from the receiving device. The method of claim 1, If the encryption key setting signal is not input, the microprocessor of the receiving device receives an image signal encrypted with the encryption key from the camera, and compares the encryption key stored in the storage means with the encryption key of the encrypted signal to match the image signal. And a security camera with a built-in encryption circuit, characterized in that for displaying an error message if it does not match. A plurality of security including a CCD and a digital signal processor, and encryption logic for receiving a digital image signal from the digital signal processor and encrypting it using an encryption key generated by inputting a serial number which is a unique value given at the time of camera production. A cryptography of the receiving device in a security system comprising a receiving camera, a receiving device including a decryption logic for receiving the encrypted signal transmitted from the camera and decrypting the same, and a microprocessor for outputting the decrypted video signal to a monitor. As a key setting method, An authentication step of authenticating a user through an authentication step through an application of the system; Judging whether a signal for setting an encryption key of a camera is input from an authenticated user; An encryption key request step of requesting an encryption key of the camera when a signal is input in the determining step; An encryption key decryption step of receiving an image signal encrypted with an encryption key from a camera and extracting an encryption key; Setting the encryption key of the security system having a security camera with a built-in encryption circuit, including an encryption key setting end step of storing the extracted encryption key and transmitting an encryption key setting completion signal to the camera to terminate the encryption key setting. Way. The method of claim 3, If the encryption key is not set in the step of determining whether a signal for setting the encryption key of the camera is input, the encryption key for comparing the encryption key of the encrypted video signal input from the camera with a previously stored encryption key and outputting a warning message if it does not match. The encryption key setting method of a security system having a security camera with a built-in encryption circuit, characterized in that it further comprises a key error step. A plurality of security including a CCD and a digital signal processor, and encryption logic for receiving a digital image signal from the digital signal processor and encrypting it using an encryption key generated by inputting a serial number which is a unique value given at the time of camera production. An encryption key of the camera in a security system comprising a receiving camera, a decoding device for receiving an encrypted signal transmitted from the camera and decrypting it, and a microprocessor for outputting the decrypted video signal to a monitor As a setting method, Determining whether to set an encryption key or not; An encryption key request signal checking step of determining whether an encryption key request signal is input from a receiving device if the encryption key is not set; A transmission step of generating an encryption key when the encryption key request signal is input in the encryption key request signal checking step, encrypting an image signal with the generated encryption key, and transmitting the encrypted signal to a receiving device; And receiving a signal indicating that the encryption key has been set up from the receiving device and storing the encrypted key setting step.

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