Determined factor parameter analysis for system of information recovery from USB-keyboard compromising emanations

This paper is devoted to the development of calculation algorithm in order to determine the significance of different a priori information on the quality of USB-keyboard compromising emanation recovery. The system was investigated under condition of non-Gaussian interferences with Johnson distribution defining the industrial noise. As the calculation result according to developed algorithm based on elimination method it has been found the one of the most important factor is factor defining the noise parameters, and consequently, the achievement of maximal effective radio countermeasure is carried out at the choice of masking noise.