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Electromagnetic radiation of computer contains video information which causes the information leakage. Electromagnetic radiation of PC contains video information, and the image can be reconstructed. In this paper, the way of computer video information transmission of DVI video interface be analyzed. The model of time and frequency domain corresponding to serial transmission and parallel transmission...
Electromagnetic radiation of PC contains video information, and the image can be reconstructed. It is well known after the Van Eck's paper. The video cable used to connect the display with the graphics controller turned out to be the primary source of the leaking signal. For digital video interface, not all kinds of color images can be intercepted and reconstructed. Firstly we analyzed which color...
In this paper, on the basis of the spot pulse width corresponded with character video information vertical stroke, the safe bandwidth of video information is confirmed, filtering image quality appraisal model which takes difference threshold limit value as distinction parameter is built by Weber - Fechner law, the corresponding relation of filtering stop-band cut-off frequency and character is determined,...
In this paper, the video information camouflage processing method based on the pulse amplitude modulation was studied aim at the electromagnetic characteristic of computer video information. Camouflage information modulation function was proposed, the matching vision relation between character information and background color was determined, and the image fusion processing algorithm of camouflage...
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