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A Highly Consistent and High-speed Physical Layer Key Generation Scheme

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Abstract

There are some problems that the bit error rate is high but generation rate is low in existing physical layer secret key generation schemes, so we propose a highly consistent and high-speed secret key generation scheme in this paper. This scheme not only can achieve high consistency and high generation rate, but also can ensure randomness of secret key. First, the scheme conducts channel pre-detection to calculate weighted vectors to smooth the noise. Then, a modified level crossing algorithm is proposed to improve key consistency greatly. Furthermore, we put forward cyclic interleaving quantization method that can linearly improve key generation rate and enhance randomness of secret key. Simulation results show that the scheme can achieve zero bit disagreement, and key generation rate can reach at least 495% when SNR is 20 dB.

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Data Availability

The data that support the findings of this study are available on request from the corresponding author, [J.M.L], upon reasonable request.

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Acknowledgements

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Funding

This work was supported by NaturalScience Basic Research Program of Shaanxi (Program No.2021JM-134).

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Authors and Affiliations

  1. State Key Laboratory of Integrated Service Networks, Xidian University, Xi’an, 710071, People’s Republic of China

    Jiayu Zhao, Jingmei Liu & Ruibin Dai

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  1. Jiayu Zhao
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  2. Jingmei Liu
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  3. Ruibin Dai
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by JZ, JL and RD. The first draft of the manuscript was written by JZ and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Jingmei Liu.

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Zhao, J., Liu, J. & Dai, R. A Highly Consistent and High-speed Physical Layer Key Generation Scheme. Wireless Pers Commun 133, 1105–1122 (2023). https://doi.org/10.1007/s11277-023-10806-5

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