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Movement Aided Secret Key in Body Area Networks

Recently most wireless network security schemes merely based on physical layer characteristics tackle the two fundamental issues – device authentication and secret key extraction separately. It remains an open problem to simultaneously achieve device authentication and fast secret key extraction merely using wireless physical layer characteristics, without the help of advanced hardware or out-of-band channel. In this paper, we answer this open problem in the setting of Wireless Body Area Networks. We propose MASK-BAN, a lightweight fast authenticated secret key extraction scheme for intra-BAN communication.Our scheme neither introduces advanced hardware nor relies on out-of-band channels.

To perform device authentication and fast secret key extraction at the same time, we exploit the heterogeneous channel characteristics among the collection of on-body channels during body motion. On one hand, MASK-BAN achieves authentication through multi-hop stable channels, which greatly reduces the false positive rate as compared to existing work. On the other hand, based on dynamic channels, key extraction between two on-body devices with multi-hop relay nodes is modeled as a max-flow problem, and a novel collaborative secret key generation algorithm is introduced to maximize the key generation rate. Extensive realworld experiments on low-end commercial-off-the-shelf sensor devices validate MASK-BAN’s great authentication capability and high secret key generation rate.

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