Institute of Electrical & Electronic Engineers
This paper investigates generation of a secret key from a reciprocal wireless channel. In particular the authors consider wireless channels that exhibit sparse structure in the wideband regime and the impact of the sparsity on the secret key capacity. They explore this problem in two steps. First, they study key generation from a state-dependent discrete memoryless multiple source. The state of source captures the effect of channel sparsity. Secondly, they consider a wireless channel model that captures channel sparsity and correlation between the legitimate users' channel and the eavesdropper's channel. Such dependency can significantly reduce the secret key capacity.