A method and device for generating an interference signal

Abstract

The invention provides an interference signal generation method and device. The method includes the steps that an interference signal is added to video information needing to be protected, wherein the interference signal is a video stable coherent interference signal, and the cycle of the interference signal equals the frame cycle of the video information; a true random sequence interference signal is output through a true random sequence; data of the current frame in the video information are collected and are compared with data of the former frame to obtain position information of points corresponding to which data are changed; an interference signal corresponding to the position information is replaced by the true random sequence interference signal to generate a real-time interference signal. By means of the interference signal generation method and device, the problem that electromagnetic signals leaked from important computers by accident are received and restored by lawbreakers and accordingly social and economic orders are disrupted is effectively avoided, and information restoring difficulty is greatly improved.

Description

technical field [0001] The invention relates to the field of information security, in particular to a method and device for generating an interference signal. 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.

Images