Interference signal coding method and device

Abstract

The invention provides an interference signal coding method and device. The interference signal coding method comprises the steps that interference signals are added to video information needing to be protected, the interference signals are video stability related interference signals, and the cycle of the interference signals is consistent with the frame cycle of the video information; true random sequence interference signals are output according to a true random sequence; screenshot and preprocessing are carried out on the current frame of the video information, image data after preprocessing are compared with image data of the previous frame, position information of changing points of the data is obtained, and a position information matrix is formed; the interference signals corresponding to the position information matrix are replaced by the true random sequence interference signals, and real-time interference signals are generated. According to the interference signal coding method and device, the problem that social and economic orders are damaged due to the fact that important electromagnetic signals which are accidentally leaked by a computer are received and restored by lawbreakers is solved, and difficulty of information recover is greatly increased.

Description

technical field [0001] The present invention relates to the field of information security, in particular to an interference signal encoding method and device. Background technique [0002] When the computer system is working, electromagnetic leakage of information will occur in the display screen, case gap, keyboard, connecting cable and interface of the system. The leakage method is line conduction emission and space radiation. The leakage intensity depends on the circuit design and structure of the system. design and operating characteristics. [0003] Research at home and abroad has shown that the electromagnetic leakage signal of the computer can be captured by receiving equipment (receiver, spectrum analyzer, etc.), and the original video information of the computer can be restored through post-data processing methods. [0004] In order to reduce the risk of computer video information leakage, computers that process important information must take security measures. T...

AI Technical Summary

Problems solved by technology

However, for white noise signals, it is generally generated by pseudo-random sequences such as m sequences. Although this method is simple to implement, the interference efficiency is low. It is easy to use periodic accumulation method or time-frequency analysis method to reduce the interference signal It is filtered out from the received restoration signal; and for the visually stable interference signal, its signal period is the same as the video information frame period, and the content is stable. Although it can effectively prevent the information restoration method of periodical accumulation method, it is time-frequency The analysis method leaves convenience, the receiver can extract the complete sequence of the interference signal through the reception and data processing of the interference signal, and then filter the interference signal from the received restoration signal through the signal processing method

[0006] According to the above description, it can be seen that none of the interference signal generation methods in the prior art can effectively prevent the information restoration technology of data processing methods such as periodical averaging method or time-frequency analysis method.

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