Extracting secret key from channel measurements in wireless sensor networks
SoftCOM'09 Proceedings of the 17th international conference on Software, Telecommunications and Computer Networks
Robust uncorrelated bit extraction methodologies for wireless sensors
Proceedings of the 9th ACM/IEEE International Conference on Information Processing in Sensor Networks
A secure and anonymous cooperative sensing protocol for cognitive radio networks
Proceedings of the 4th international conference on Security of information and networks
Zero reconciliation secret key generation for body-worn health monitoring devices
Proceedings of the fifth ACM conference on Security and Privacy in Wireless and Mobile Networks
Analysis of a secure cooperative channel sensing protocol for cognitive radio networks
Proceedings of the Fifth International Conference on Security of Information and Networks
Multi-user wireless channel probing for shared key generation with a fuzzy controller
Computer Networks: The International Journal of Computer and Telecommunications Networking
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Secret keys can be generated and shared between two wireless nodes by measuring and encoding radio channel characteristics without ever revealing the secret key to an eavesdropper at a third location. This paper addresses bit extraction, i.e., the extraction of secret key bits from noisy radio channel measurements at two nodes such that the two secret keys reliably agree. Problems include 1) nonsimultaneous directional measurements, 2) correlated bit streams, and 3) low bit rate of secret key generation. This paper introduces high-rate uncorrelated bit extraction (HRUBE), a framework for interpolating, transforming for decorrelation, and encoding channel measurements using a multibit adaptive quantization scheme which allows multiple bits per component. We present an analysis of the probability of bit disagreement in generated secret keys, and we use experimental data to demonstrate the HRUBE scheme and to quantify its experimental performance. As two examples, the implemented HRUBE system can achieve 22 bits per second at a bit disagreement rate of 2.2 percent, or 10 bits per second at a bit disagreement rate of 0.54 percent.