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The physical-layer secret key generation has emerged as a promising solutionfor establishing cryptographic keys by leveraging reciprocal and time-varyingwireless channels. However, existing approaches suffer from low key generationrates and vulnerabilities under various attacks in slowly varying environments.We propose a new physical-layer secret key generation approach with channelobfuscation, which improves the dynamic property of channel parameters based onrandom filtering and random antenna scheduling. Our approach makes one partyobfuscate the channel to allow the legitimate party to obtain similar dynamicchannel parameters yet prevents a third party from inferring the obfuscationinformation. Our approach allows more random bits to be extracted from theobfuscated channel parameters by a joint design of the K-L transform andadaptive quantization. A testbed implementation shows that our approach,compared to the existing ones that we evaluate, performs the best in generatinghigh entropy bits at a fast rate and a high-security level in slowly varyingenvironments. Specifically, our approach can achieve a significantly fastersecret bit generation rate at about $67$ bit/pkt, and the key sequences canpass the randomness tests of the NIST test suite.

Fast and Secure Key Generation with Channel Obfuscation in Slowly Varying Environments