JP2001318875A - System for preventing data burglary of computer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the data burglary preventing system of a computer capable of preventing the data or information of a computer from being stolen by enciphering or decoding data transmission and reception between a computer main body (arithmetic processing storage part) and peripheral equipment. SOLUTION: This system is provided with a function for enciphering and decoding the transmission and reception of information and data between the arithmetic processing storage part of a computer and external peripheral equipment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data theft prevention system for a computer, and more particularly to a computer data theft prevention system with enhanced security for protecting the system by preventing the use contents and operations of the computer from being stolen outside. .

[0002]

2. Description of the Related Art Hitherto, as a method for preventing data theft of a computer, it has been considered from the viewpoint of preventing a computer from being illegally accessed. In some cases, the access is made not only directly from the keyboard but also through a computer network such as the Internet, but in any case, the basis is identification of the accessor using a password.

As shown in FIG. 2, a computer currently used includes a main body 10 and peripheral devices such as a keyboard 20, a display unit (display) 21, a mouse 22, and a printer 23, respectively, with cables 20A, 21A, 22A, and 22A.
Many are connected at 23A. The main body 10 is an arithmetic processing storage unit of the computer, and includes a CPU unit 11 and a memory 12. In particular, most desktop personal computers using a CRT monitor or a liquid crystal display as the display unit 21 are in this mode. However, the fact is that no data is transmitted through these cables 20A to 23A and no antitheft measures are taken.

[0004]

For this reason, if another cable is connected to the cable connecting the arithmetic processing storage section of the computer and the external peripheral device, and if the cable branches, the signal is easily taken out to decode the data. be able to. FIG. 3 shows the situation, in which another cable 30 is connected to the cable 20A.
By connecting A and branching, and connecting the decryption device 30, all data transmission and reception between the main body 10 and the keyboard 20 can be decrypted. Also, cable 21A
When the radio wave transmitter 31 is attached to the device and the radio wave 32 from the radio wave transmitter 31 is received and decoded by the decoding device 33, the display unit 21 is displayed.
Can decode all the data displayed in. Since the radio wave transmitter 31 transmits the radio wave 32 according to the signal transmitted through the cable 21A, the signal transmitted through the cable 21A can be decoded by receiving and reading the radio wave 32.

As described above, in a current computer (especially a desktop personal computer), a keyboard and a mouse as input means, and a display unit and a printer as output means are provided with:
No security measures have been taken. For this reason, the conventional computer has a disadvantage that the input / output contents thereof are easily taken out of the system without the user's knowledge, and the use contents and operation of the computer are deciphered. The password set in the computer has no effect on the decoding method as shown in FIG. For example, if a password is entered at the start of use of the computer, the password itself is stolen at that time.

The present invention has been made in view of the above circumstances, and an object of the present invention is to encrypt and decrypt data transmitted and received between a computer main unit (arithmetic processing storage unit) and peripheral devices. An object of the present invention is to provide a computer data theft prevention system for preventing data and information of a computer from being stolen.

[0007]

SUMMARY OF THE INVENTION The present invention is directed to a computer data theft prevention system.
This is achieved by providing encryption and decryption functions for transmitting and receiving information and data between the arithmetic processing storage unit of the computer and external peripheral devices. Further, the object of the present invention is to provide a computer comprising an input unit, a CPU unit, a memory and a display unit, wherein information and data are transmitted and received between the CPU unit and the input unit, the memory and the display unit. By performing encryption and decryption.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, data output from a keyboard or a mouse is encrypted once and then transmitted to a computer main unit (arithmetic processing storage unit) via a cable, and the computer main unit decrypts the received data. And then process. When outputting control data and the like from the computer to the keyboard and the mouse, the computer and the computer encrypt and transmit the control data and the like, and the keyboard and the mouse receiving the data decrypt the data and decode it. If it is received, the encrypted data is decrypted in the reverse procedure and returned to the original data. The encryption and decryption procedures are preset to be valid only between the keyboard and mouse and the computer itself. In addition,
Known techniques (hardware and software) can be applied to encryption and decryption.

Further, the computer body encrypts the data to be output from the outside once, passes it to a display unit or a printer via a cable, and the display unit or the printer decodes the received data, decodes the data, and displays the data. Or print. When the display unit or the printer outputs a response signal or the like to the computer main body, the response signal or the like is transmitted after being encrypted. The decryption is set in advance so that the encrypted data is restored by the reverse procedure, and the encryption and decryption procedures are effective only between the display unit and the printer and the computer main body.

As described above, since the signal transmitted through the cable is encrypted data or information, even if the signal is stolen to the outside as shown in FIG. 3, the data or information is encrypted. The content is secure.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a keyboard 40 according to an embodiment of the present invention.
The keyboard 40 includes a key 41 such as a numeric keypad, a logical operation unit 42 that processes a signal from the key 41, and an output of the logical operation unit 42. An encryption circuit 43; a transmission buffer 44 for transmitting a signal from the encryption circuit 43 via the transmission cable 60; a reception buffer 45 for receiving a signal transmitted via the transmission cable 60; And a decryption circuit 46 for decrypting the output of the output 45. The arithmetic processing unit 50 also includes a reception buffer 51 that receives a signal sent via the transmission cable 60, a decoding circuit 52 that decodes the output of the reception buffer 51, and a signal that is output from the decoding circuit 52. It comprises a logical operation unit 53 for processing, an encryption circuit 54 for encrypting the output of the logical operation unit 53, and a transmission buffer 55 for transmitting a signal from the encryption circuit 54 via the transmission cable 60. I have.

In such a configuration, the keyboard 40
Logic operation unit 42 detects a key signal from key 41,
The information of the key 41 is encrypted by the encryption circuit 43 of the keyboard 40 and transmitted through the transmission buffer 44 to the transmission cable 60.
Output the encrypted data to This data passes through the reception buffer 51 of the arithmetic processing unit 50,
Is returned to the original data and input to the logical operation unit 53.

Conversely, when data is sent from the arithmetic processing unit 50 to the keyboard 40, the logical operation unit 53 of the arithmetic processing unit 50
Is encrypted by the encryption circuit 54, and the encrypted data is output to the transmission cable 60 via the transmission buffer 55. This data is stored on the keyboard 40
, And is returned to the original data by the decoding circuit 46 and input to the logical operation unit 42.

As described above, according to the present invention, all data transmitted through the transmission cable 60 between the keyboard 40 and the arithmetic processing unit 50 is encrypted.
, Or even if the data is stolen by attaching a radio wave transmitter to the transmission cable 60, the content of the data is safe because it cannot be decrypted.

In the above-described embodiment, the encryption and decryption between the keyboard 40 and the arithmetic processing unit 50 have been described.
Similarly, signals may be transmitted and received between the arithmetic processing unit 50 and external peripheral devices such as a display unit, a printer, and a mouse by performing encryption and decryption. Further, the arithmetic processing unit 50 may include a memory. Further, in the above-described example, the case where the signal is transmitted by the transmission cable is described. However, there is no wiring of the transmission cable as in a notebook computer, and the arithmetic processing storage unit and the external peripheral device are formed by a printed circuit board or internal wiring. The present invention is also applicable to a case in which

In the above embodiment, the logical operation unit, the encryption circuit, and the decryption circuit are described as hardware.
These can be realized by software.

[0018]

As described above, according to the present invention, the data on the transmission cable or the internal wiring between the arithmetic processing storage unit of the personal computer and the external peripheral device and the printed circuit board is encrypted. As a confidentiality is complete. Since all data and information in places that can be stolen from outside are encrypted, even if stolen, the data will not be stolen.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration example of a general computer.

FIG. 3 is a block diagram illustrating an example of stealing data from a computer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Computer main body (arithmetic processing storage part) 11 CPU part 12 Memory 20, 40 Keyboard 21 Display part 22 Mouse 23 Printer 30, 33 Decryption device 50 Arithmetic processing part 43, 54 Encryption circuit 46, 52 Decryption circuit

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Susumu Yamada, Inventor F-term (reference) in Industrial System Development Co., Ltd. 1-13-23 Shintomi, Chuo-ku, Tokyo 5B014 GC01 5B020 KK05 KK21 5J104 AA01 AA47

Claims (8)

[Claims] An information theft prevention system for a computer, characterized in that information and data transmission / reception between an arithmetic processing storage unit of the computer and an external peripheral device have encryption and decryption functions. . 2. The device according to claim 1, wherein said peripheral device is a keyboard.
A computer data theft prevention system according to claim 1. 3. The system according to claim 1, wherein said peripheral device is a display unit. 4. The system according to claim 1, wherein said peripheral device is a printer. 5. The system according to claim 1, wherein the peripheral device is a mouse. 6. A computer comprising an input unit, a CPU unit, a memory, and a display unit, wherein information and data transmitted and received between the CPU unit and the input unit, the memory, and the display unit are encrypted. A data theft prevention system for a computer, wherein the computer data is decrypted and decrypted. 7. The computer data theft prevention system according to claim 6, wherein said computer includes a printer, and said encryption and decryption are performed also between said CPU section and said printer. . 8. The computer according to claim 1, wherein said computer comprises a mouse,
7. The computer data theft prevention system according to claim 6, wherein the encryption and decryption are performed also between a PU unit and the mouse.