METHOD FOR DETECTING ELECTROMAGNETIC INFORMATION LEAKAGE FROM COMPUTER MONITOR

Jian Mao, Peiguo Liu, Jinming Liu and Zhenzhong Han

Keywords

Electromagnetic radiation, information leakage, information security,spectrum analysis, computer monitor

Abstract

The computer monitors can generate electromagnetic (EM) informa- tion leakage, which is related to the display principle. Refresh rate, horizontal frequency, and pixel frequency were confirmed as key factors to reproduce video images showed on the monitor from EM radiation. To estimate the risk of information leakage, a detection method based on the display principle was introduced. The method is to distinguish and match the spectrum interval from the radiated EM signals by multi-resolution spectrum analysis. Using the pro- posed method, EM information leakage such as working frequencies of the computer monitor was effectively identified.

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