Secret-key reconciliation by public discussion
EUROCRYPT '93 Workshop on the theory and application of cryptographic techniques on Advances in cryptology
Robust key generation from signal envelopes in wireless networks
Proceedings of the 14th ACM conference on Computer and communications security
Radio-telepathy: extracting a secret key from an unauthenticated wireless channel
Proceedings of the 14th ACM international conference on Mobile computing and networking
On the effectiveness of secret key extraction from wireless signal strength in real environments
Proceedings of the 15th annual international conference on Mobile computing and networking
BodyNets '09 Proceedings of the Fourth International Conference on Body Area Networks
High-Rate Uncorrelated Bit Extraction for Shared Secret Key Generation from Channel Measurements
IEEE Transactions on Mobile Computing
Secret keys from entangled sensor motes: implementation and analysis
Proceedings of the third ACM conference on Wireless network security
Robust uncorrelated bit extraction methodologies for wireless sensors
Proceedings of the 9th ACM/IEEE International Conference on Information Processing in Sensor Networks
Achieving single channel, full duplex wireless communication
Proceedings of the sixteenth annual international conference on Mobile computing and networking
Temporal Link Signature Measurements for Location Distinction
IEEE Transactions on Mobile Computing
Channel Identification: Secret Sharing Using Reciprocity in Ultrawideband Channels
IEEE Transactions on Information Forensics and Security - Part 1
Rayleigh fading channels in mobile digital communication systems .I. Characterization
IEEE Communications Magazine
Towards trustworthy medical devices and body area networks
Proceedings of the 50th Annual Design Automation Conference
Securing data provenance in body area networks using lightweight wireless link fingerprints
Proceedings of the 3rd international workshop on Trustworthy embedded devices
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Wearable wireless sensor devices are key components in the emerging technology of personalized healthcare monitoring. Medical data collected by these devices must be secured, especially on the wireless link to the gateway equipment. However, it is difficult to manage the required cryptographic keys, as users may lack the awareness or requisite skills for this task. Alternatively, recent work has shown that two communicating devices can generate secret keys derived directly from symmetrical properties of the wireless channel between them. This channel is also strongly dependent on positioning and movement and cannot be inferred in detail by an eavesdropper. Existing schemes, however, yield keys with mismatching bits at the two ends, requiring reconciliation mechanisms with high implementation and energy costs that are unsuitable for resource-poor body-worn devices. In this work we propose a secret-key generation mechanism which uses signal strength fluctuations caused by incidental motion of body-worn devices to construct shared keys with near-perfect agreement, thereby avoiding reconciliation costs. Our contributions are: (1) we analyse channel measurement asymmetries caused by non-simultaneous probing of the channel by the link end-points, (2) we propose a practical filtering scheme to minimize these asymmetries, dramatically improving signal correlation between the two ends without reducing entropy, and (3) we develop a method to restrict key generation to periods of channel fluctuation, ensuring near perfect key agreement. To the best of our knowledge, this work is the first to demonstrate the feasibility of generating high quality secret keys with zero reconciliation cost in body-worn networks for healthcare monitoring.