Method for Detecting Information Leakage from Computer Display in Electromagnetic Radiation

Information might be leaked through electromagnetic radiation from a computer display. Radiation containing information and radiation without information should be treated differently. Therefore, a novel algorithm has been developed to determine whether or not information is leaked in electromagnetic radiation. Motivated by the observation that the Gabor coefficients of information part and the non-information part of reconstructed image follow different statistical distribution, we propose a method to describe these differences and detect information leakage. In this method, probability graph theory is used and the probability mean distance is defined. In addition, the detection rule is set to realize automatic detection of information. By using this method, we can accurately and efficiently detect the information leakage in electromagnetic radiation from a computer display.