Efficient method for estimating propagation area of information leakage via EM field

Information leakage via electromagnetic (EM) radiation is an emerging issue for designers and users of electrical information devices. The importance of estimating the propagation area of information leakage is increasing due to the high demand for protecting such devices from eavesdroppers. We propose an efficient method for estimating the propagation area of information leakage via an EM field. The idea behind the method is to exploit the temporal variance of noise at the area of interest in addition to the source intensity and the transfer function. We show that the values of information acquisition estimated by our method are in good agreement with actual information acquisition as measured in the EM field at an area of interest.