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Analysis on Information Leakage of Computer Displays via Conducted Emission on Power Line

The security problem of screen image leakage from a display unit has become more and more serious with the rapid speed of signal transmission technology. This paper presents a novel investigation on the characteristics of the power line compromising channel. By introducing an echo-based power line model, a measurement system has been developed to draw a preliminary conclusion on the low-passed and frequency selective characteristic for the signal eavesdropping. In order to check the validity of the measurement system, test experiments were carried out to measure the information signal. The measurement system is composed of a coupler, PC and a spectrum receiver based on which we can easily analyze and evaluate the information leakage in radiated disturbance from a PC display in the power line channel.