JPH03128540A - Security system - Google Patents

Abstract

PURPOSE:To make difficult a cipher to be deciphered by a hacker and to improve the safety of communication by changing a ciphering rule by a keyboard or voice input each time the communication is executed. CONSTITUTION:The keyboard or voice input is coded by a converter 2 and a frame pattern is prepared by a frame synchronizing pattern preparing circuit 3 corresponding to the input. In the converter 2, a value executing the ASCII conversion of the input is defined as the frame pattern in the case of the keyboard input and a value executing the ASCII conversion of a voice recognized result is defined as the frame pattern in the case of a voice. Since the ciphering rule can arbitrarily be changed for each transmission, it is made difficult to monitor a line, to decipher the cipher by a computer and to execute wire tapping, and there is an effect to improve the safety of the communication.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a type of security based on signal encryption in communication safety.

[Conventional technology]

In the conventional device, only the data bits are randomized according to the unique law, as described in Japanese Patent Application Laid-Open No. 56-34253.

[Problem to be solved by the invention]

In the conventional techniques described above, consideration has not been given to decryption using a computer or the like, and encryption using a fixed pattern has the problem that information can be easily intercepted by decryption.

An object of the present invention is to make it difficult for backers to decrypt the encryption pattern by changing the encryption pattern each time communication is made, thereby increasing the security of communication.

[Means to solve the problem]

In order to achieve the above object, three methods will be described in this specification, but the basic concept is to change the encryption rule each time communication is made using a keyboard or voice input.

(Means 1); Changing the frame synchronization pattern The structure of data in digital transmission is roughly divided into signal bits such as frame synchronization patterns and data bits, as shown in FIG.

Conventionally, a uniquely determined frame pattern (for example, “
1101''), but this version has added a function to arbitrarily set the frame pattern using the keyboard or voice input.

FIG. 2 shows a functional diagram of a conventional system, and FIG. 3 shows a functional diagram of an embodiment of the present invention.

The rules for converting keyboard or voice input into bangs suitable for frame synchronization are outside the scope of this patent.

(Means 2): The conventional method for changing the data encryption agent is based on the device model or R
Data was primarily modulated and demodulated by OM.

In order to make it possible to arbitrarily change the encryption rules for data each time a communication is made, a function has been added that allows the encryption rules to be changed using the keyboard or voice input. FIG. 5 shows a functional diagram showing one embodiment.

(Meaning 3): Changing the modulation and demodulation frequency In the conventional system, as shown in FIG. 6, several types of modulation and demodulation frequencies were changed over using a switch, so there was a problem that increasing the number of frequency types increased the amount of hardware.

In the present invention, by changing the input voltage of a VCO (voltage controlled oscillator) according to keyboard or voice input, it is possible to obtain various outputs with a small amount of hardware by changing the modulation or carrier frequency. .

FIG. 7 shows a functional diagram showing one embodiment.

[Effect]

The frame button shown in Figure 3 and the PN button (cipher rules) shown in Figure 5 can be set arbitrarily using the keyboard or voice input.By changing the code rules each time a communication is made,
Even if the line is constantly monitored and an attempt is made to decipher the encryption rules using a computer or the like, deciphering can be made difficult, and communication security can be improved.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 3 and 5. This example is a case of digital transmission.

In FIG. 3, the button of the frame synchronization bit in the communication data can be changed arbitrarily.

Conventionally, a fixed frame button (for example, 1010) was added to data 1 such as audio and images to create transmission data. On the other hand, a converter 2 encodes keyboard and voice input, and a frame synchronization button generation circuit 3 generates a frame button corresponding to the input.

Although the frame synchronization button generation circuit 3 may have an encryption function, its basic function is a RAM. The converter 2 is designed to use a value obtained by converting the input into ASCII in the case of keyboard input, and a value obtained by converting the voice recognition result into frame bang in the case of voice.

However, since there are an infinite number of conversion rules, conversion rules are not included in the scope of this patent.

FIG. 5 shows an example in which the encryption rules for data bit 1 such as audio and images in transmission data can be changed arbitrarily. The operation of converter 5 is the same as described in FIG. There are various methods for encrypting data, but we will explain the case of PN button.

FIG. 8 shows the configuration of a conventional PN bang generator.

The random rule is uniquely fixed depending on the number of stages of flip-flops (hereinafter referred to as FF) and to which stage the feedback is returned.

FIG. 9 shows an embodiment of a PN bang generator in which the random rule can be changed arbitrarily.

Turn switch 1 to ○N1 according to the output of RAM4 shown in Figure 5.
The random rule can be set arbitrarily by setting it to 0FF. 2 is a PN pattern generation circuit, and 3 is a modulation circuit 2 shown in FIG.

According to this embodiment, the encryption rules can be arbitrarily changed each time transmission is made, making it difficult to monitor the line and use a computer to decrypt and eavesdrop, thereby increasing the security of communication.

〔Effect of the invention〕

According to the present invention, since the encryption rules can be changed arbitrarily each time communication is made, it becomes difficult to decipher the code even using a computer or the like, which has the effect of increasing the security of communication.

[Brief explanation of the drawing]

FIG. 1 is a data configuration diagram in digital transmission according to an embodiment of the present invention, FIG. 2 is a functional explanatory diagram showing a conventional method of a frame creating circuit, and FIG. 3 is a functional explanatory diagram showing an example of the frame creating circuit. , FIG. 4 is a functional explanatory diagram of a conventional data encryption circuit, FIG. 5 is a functional explanatory diagram showing an example of the data encryption circuit, FIG. 6 is a functional explanatory diagram of a conventional modulation circuit, and FIG. 7 is a functional explanatory diagram of a conventional modulation circuit. FIG. 8 is a functional explanatory diagram showing an example of a modulation circuit. FIG. 8 is a diagram of a conventional PN bang generating circuit. FIG. 9 is a functional explanatory diagram showing an example of a PN bang generating circuit. 1...Data, 2...Conversion, 3...Frame synchronization pattern creation. Katsurazu Otoko Volume 4 Yuzu Atsushi + Figure 1 Juatsu Otsu Figure 1

Claims (1)

[Claims] 1. A communication security system that maintains safety through fixed encryption, which is characterized by having a function that allows the encryption rules to be arbitrarily changed each time communication is made.