Power analysis attack on jamming assisted key agreement

Physical layer key agreement which utilizing the variations of the wireless channel to generate the shared key is a trend in wireless communication. This kind of schemes has shown its effectiveness against eavesdropping. But physical layer key agreement schemes utilizing channel state to generate the key have quite low speed due to the requirement of channel changing which brings the variations of the channel. iJam is a novel scheme utilizing assisted jamming signals to generate shared key without the requirement of channel variation which increasing the key generation speed. In this paper, we propose a power analysis attack which can break iJam by analyzing the power difference of each received signal. Simulation results show that our attack breaks iJam in most time.