Prediction accuracy of band-restricted random signals and security risk in statistical key exchange

Statistical key exchange relies on signals with irreducible randomness to covertly transmit information. Because of causality, there may be disturbances during the transient turn-on, which can pose as a security risk. Linear prediction and the GerchbergPapoulis methods are used to analyze the risk quantitatively. With properly generated signals, the probability of leak during the transient turn-on is found to be comparable to that of the steady state. The transient signal does not pose as an additional security risk.