Defend Countermeasure Of Anti-leakage Based On Numeric Interface Video Information Leakage Principle

The electromagnetic leakage of video signal is the main information carrier of computer safety. With the computer frequency, display technology and addition equipments ceaseless update, information safety becomes more and more challenge.This article analyzes the display character of currently mainstream DVI digital video signal, include the character of digital impulse and special coding of TMDS.Contrast the difference with the VGA display system and give the risk. Advance the importance of basing on adjacent pixel's hamming distance in binary form, and the emanation adding of digital pulse edges. Besides, the anti-intercept display technology which bases on safety combination color and dangerous combination color are obtained.At the video information anti-intercept arithmetic, integrated consider color mixture characteristic of human eyes, and the pure multicolor can easy be intercept receive, respectively advance the interpolation randomizing technology for black and white character image, and the rainbow randomizing technology for multicolor image. And the hardware solution of video information increase the DVI interface's ESD protect circuit, consider the EMI restraint and timing controlling on RGB video layout. Finally complete the card's PCB of video information. Furthermore, the test results of all conclusions above are given, verifying the function of our video information anti-intercept arithmetic.