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Generating keys and keeping them secret is critical in secure communications.Due to the "open-air" nature, key distribution is more susceptible to attacksin wireless communications. An ingenious solution is to generate common secretkeys by two communicating parties separately without the need of key exchangeor distribution, and regenerate them on needs. Recently, it is promising toextract keys by measuring the random variation in wireless channels, e.g., RSS.In this paper, we propose an efficient Secret Key Extraction protocol withoutChasing down Errors, SKECE. It establishes common cryptographic keys for twocommunicating parties in wireless networks via the realtime measurement ofChannel State Information (CSI). It outperforms RSS-based approaches for keygeneration in terms of multiple subcarriers measurement, perfect symmetry inchannel, rapid decorrelation with distance, and high sensitivity towardsenvironments. In the SKECE design, we also propose effective mechanisms such asthe adaptive key stream generation, leakage resilient consistence validation,and weighted key recombination, to fully exploit the excellent properties ofCSI. We implement SKECE on off-the-shelf 802.11n devices and evaluate itsperformance via extensive experiments. The results demonstrate that SKECEachieves a more than 3x throughput gain in the key generation from onesubcarrier in static scenarios, and due to its high efficiency, a 50% reductionon the communication overhead compared to the state-of-the-art RSS basedapproaches.

Efficient and Secure Key Extraction using CSI without Chasing down Errors