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| Relay Cooperative Secret Key Generation for Quasi-static Channels in Internet of Things |
| XIAO Shuaifang GUO Yunfei BAI Huiqing JIN Liang HUANG Kaizhi |
| (National Digital Switching System Engineering & Technological Research Center, Zhengzhou 450002, China) |
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Abstract A secret key generation scheme based on a cooperative relay is proposed to improve the generated secret key rate for quasi-static channels in Internet of things. Firstly, the two legitimate nodes send training sequences to estimate the direct channel information, respectively. After that the relay employs network coding technique to participate the cooperation, and assists the two legitimate nodes to obtain the relay channels information. Finally, the two legitimate nodes agree on a secret key from the direct and relay channels information using the direct channel without the help of the relay. Security analysis results show that the scheme can improve the achievable secret key rate, and the achievable key rate increases linearly with SNR, approaching the optimal rate. Monte Carlo simulation verifies the security analysis results, and obtains that increasing the relay nodes, selecting the relay with a larger variance channel can further improve the achievable secret key rate.
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Received: 26 April 2017
Published: 01 November 2017
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| Fund:The National Natural Science Foundation of China (61379006), The National 863 Program of China (2015AA01A708), The Science Fund for Creative Research Groups of the National Natural Science Foundation of China (61521003) |
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Corresponding Authors:
XIAO Shuaifang
E-mail: xiaoshuaifang@gmail.com
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