The study on video information leakage of computer

The computer may cause information leakage when working. It has become an extremely urgent question studied now. The electromagnetic leakage principle of the computer video signal was analyzed in this paper because the video cable that connects a host to a monitor is thought as a main electromagnetic radiation part on the base of the working principle of a VDU. The information leakage approach, the red and black signals and the character analysis are presented. The paper studies the electromagnetic radiation of the red signals transmitting through the video cable and analyzes their waveform characteristic. Thus the radiation characteristic of the video signal is mastered, which can provide a theoretical basis for the recovery of the video information, protection method and technique measure.