Section: New Results

Secret Key Generation

Secret key generation (SKG) from shared randomness at two remote locations has been shown to be vulnerable to denial of service attacks in the form of jamming. In [13], [2], we develop as a novel counter-jamming approach by using energy harvesting. The idea is that part of the jamming signal can potentially be harvested and converted into useful communication power. In [14], we investigate the use of frequency hopping/spreading in Rayleigh block fading additive white Gaussian noise (BF-AWGN) channels to counteract attacks from jamming. In both cases, we formulate the problems as a zero-sum game and characterize the unique Nash equilibrium of the game in closed form. Through numerical evaluations, we show that energy harvesting is an efficient counter-jamming approach that offers substantial gains in terms of relative SKG rates. In the case of BF-AWGN channels, we also use numerical results to show that frequency hopping/spreading is an effective technique for combating jamming attacks in SKG systems; a modest increase of the system bandwidth can substantially increase the SKG rates.