Electromagnetic leakage characteristics of the digital video cable

The information leakage caused by electromagnetic wave emitted by computer cables which contains video information is studied. The digital video interface of computer video information transmission is analyzed. The time and frequency domain model corresponding to serial transmission and parallel transmission of video information are built and then the leakage characteristics of different video signals which are transmitted in the serial and parallel way are obtained. According to the principle of video information interception and reconstruction, we can draw a conclusion that it is easy to intercept when the gray image is transmitted in a serial way because it shows the characteristic of “false parallel and real serial”. The experimental result agrees with it very well.