Proceedings of the 4th International Symposium on Applied Sciences in Biomedical and Communication Technologies
BANA: body area network authentication exploiting channel characteristics
Proceedings of the fifth ACM conference on Security and Privacy in Wireless and Mobile Networks
Improving secret key generation performance for on-body devices
Proceedings of the 6th International Conference on Body Area Networks
Authenticated secret key extraction using channel characteristics for body area networks
Proceedings of the 2012 ACM conference on Computer and communications security
Channel information based cryptography and authentication in wireless body area networks
BodyNets '13 Proceedings of the 8th International Conference on Body Area Networks
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In this paper, we investigate the feasibility of real time derivation of cryptographic keys in body area networks using unique characteristics of the underlying wireless channel. We perform experiments to confirm that motion does indeed provide significant highly correlated randomness on either end of the wireless link between base station and mobile mote to enable real-time key generation. Furthermore, we demonstrate that channel characteristics for a dynamic body area network consist of two different components, a fast and a slow component, each of which make a qualitatively different contribution to key generation. These components can be isolated to address specific needs of the application scenario: the fast component can yield high entropy keys at a fast rate between base station and mobile mote with some bit disagreement between the two devices, the slow component generates keys at a lower rate but with very high level of bit agreement. Our experimental results highlight this tradeoff, and our key generation protocol details the key extraction process.