Computer Science

Computer Science ›› 2024, Vol. 51 ›› Issue (5): 414-420.doi: 10.11896/jsjkx.221000037

• Information Security • Previous Articles    

Key Generation Scheme Based on RIS Multipath Random Superposition

ZHANG Zhongxin1, YI Ming2, XIAO Shuaifang2   

  1. 1 School of Cyberspace Security,Zhengzhou University,Zhengzhou 450000,China
    2 Chinese Information Engineering University of the Strategic Support Force of the People's Liberation Army,Zhengzhou 450001,China
  • Received:2022-10-08 Revised:2023-02-20 Online:2024-05-15 Published:2024-05-08
  • About author:ZHANG Zhongxin,born in 1997,postgraduate.His main research interest is physical layer security.
    YI Ming,born in 1986,Ph.D,associate researcher.His main research interests include wireless communication and cyberspace security.

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Abstract: In static scenario,the multipath phase and amplitude changes slowly,and the key rate at physical layer based on wireless channel characteristics is low,making it difficult to meet the communication security requirements of high-speed data ser-vices.This paper proposes a key generation scheme based on random superposition of multipaths with the help of RIS.Firstly,both the sender and the receiver use the real-time controllability of the RIS and the agile characteristics of the pattern to separate the multipath in the space through the multipath power spectrum characteristics.Then,the power allocation strategy of multipath is changed many times in the channel coherent time,an equivalent fast-changing channel is constructed,and the randomness of the key source is improved.Finally,a consistent security key is generated through quantization,negotiation,and privacy amplification.Simulation results show that,compared with the existing physical layer key generation schemes based on RIS antenna,the proposed scheme improves the source entropy by exploiting the multipath characteristics of the channel.On the other hand,the randomness of the source is improved by the power distribution on the multipath,which brings a certain gain to the key rate.

Key words: Physical layer key, Static scene, Multipath, Wireless channel characteristics

CLC Number: 

  • TN92
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