Video information leakage resistance method and processing device

Abstract

The invention belongs to the category of information security processing, and in particular relates to a video information leak-proof method for preventing electronic information from being stolen despitefully in the transmission process, and a processing device thereof. The method is characterized by at least comprising a process for performing low-pass filtration on the video information in transmission through a low-pass filter, and a process for overlaying a piece of high frequency video information after the low-pas filtration. The method can inhibit information leakage from sources while not influencing the transmission speed of dynamic images, and can satisfy the requirement on the compatibility of electromagnetic environment.

Description

technical field [0001] The invention belongs to the category of information security processing, in particular to a video information leakage prevention method and processing device for preventing electronic information from being maliciously stolen during transmission. Background technique [0002] With the development of science and technology, computer systems have been widely used in the storage and data processing of confidential information. Because computers and other information technology equipment will generate strong electromagnetic radiation when working, it will lead to serious leakage of confidential information processed by information technology equipment. Moreover, obtaining information through electromagnetic leakage of computers and their external devices is more accurate, timely, continuous, and concealed than information obtained through any other means. [0003] We know that the host computer and monitor of the computer are the main sources of electrom...

AI Technical Summary

Problems solved by technology

Although the use of shielding can achieve a certain shielding effect, it is not easy to improve and it is difficult to meet the technical requirements of TEMPEST

The analog filter method can be used to filter out the high-frequency components of the video signal in real time and conveniently, but at the same time, the analog filter also has many shortcomings, such as phase distortion, impedance matching requirements, and inflexible design.

Especially the phase distortion has a great influence on the correct display of the image

[0005] Chinese patent CN200510059940.9 discloses a "safety protection display", which proposes the use of an external jammer to protect video information. Although this method can play a protective role, it does not suppress leakage from the source. At the same time, it is also subject to the constraints of electromagnetic environment compatibility

But on the one hand, when moving images are transmitted between the host and the display, the amount of video data is huge and the data transmission rate is extremely fast. The CPU runs the video information leakage prevention program while running other programs, which will greatly reduce the performance of the computer. ; And it is very difficult to realize the processing and display of video signals by compiling drivers; on the other hand, this technology is only applicable to character-type display terminals, not to image / character-type display terminals

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