Secret Key Generation Method Based on Multi-stream Random Signal

Liang JIN; Aolin CAI; Kaizhi HUANG; Zhou ZHONG; Yangming LOU

doi:10.11999/JEIT181040

Volume 41 Issue 6

Jun. 2019

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Article Navigation > Journal of Electronics & Information Technology > 2019 > 41(6): 1405-1412

Liang JIN, Aolin CAI, Kaizhi HUANG, Zhou ZHONG, Yangming LOU. Secret Key Generation Method Based on Multi-stream Random Signal[J]. Journal of Electronics & Information Technology, 2019, 41(6): 1405-1412. doi: 10.11999/JEIT181040

Citation:

Liang JIN, Aolin CAI, Kaizhi HUANG, Zhou ZHONG, Yangming LOU. Secret Key Generation Method Based on Multi-stream Random Signal[J]. Journal of Electronics & Information Technology, 2019, 41(6): 1405-1412. doi: 10.11999/JEIT181040

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Secret Key Generation Method Based on Multi-stream Random Signal

doi: 10.11999/JEIT181040

National Digital Switching System Engineering & Technological Research Center, Zhengzhou 450002, China

Funds: The National Key Research and Development Program of China (2017YFB0801903), The National Natural Science Foundation of China (61601514, 61501516, 61521003, 61471396)

Received Date: 2018-11-14
Rev Recd Date: 2019-03-07

Available Online: 2019-04-04

Publish Date: 2019-06-01

Abstract

Abstract

The secret key generation method based on random signal may leak part of the common randomness information and reduce the achievable secret key rate when legal transmitter transmits random signal. In response to this problem, the secret key generation method based on multi-stream random signal is proposed. Firstly, the transmitter uses the channel reciprocity and uplink pilot to estimate the downlink channel, then the transmitter transmits mutually independent signal on every antenna. The eavesdropper is difficult to estimate all the random signals. It is difficult to estimate all the random signals for the eavesdropper, so the overlapping signal received by every antenna is difficult to be obtained by the eavesdropper. However, the legal transmitter is able to calculate the signal received by legal receiver by using the downlink channel estimated and the signal transmitted. So, the overlapping signal on every legal antenna can be used to extract secret key as common randomness. Also, the achievable secret key rate expression and the mutual information expression of common randomness are derived, and the relationship between them and the secret key security is analyzed. At last, the effectiveness of this method is verified by the simulation. The simulation results show that this method can reduce the common randomness observed by the eavesdropper to raise the achievable secret key rate and secret key security.
- Physical layer security,
- Multi-stream random signal,
- Secret key generation,
- Achievable secret key rate

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References(22)

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