Secret Key Establishment Using Temporally and Spatially Correlated Wireless Channel Coefficients

Date Added: Feb 2011
Format: PDF

When implementing data encryption and decryption in a symmetric cryptosystem, secure distribution of the secret key to legitimate nodes can be a challenge. In this paper, the authors consider establishing secret keys using the common wireless channel, with particular emphasis on the spatial and temporal correlations of the channel coefficients. Specifically, they investigate the influence of channel correlation on the bound of the key size generated from the common channel using a simple single-input single-output channel model, and they verify the existence of a sampling approach able to generate a key using the minimum possible sampling window.