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(Conference)Secret Key Generation Assisted by Intelligent Reflecting Surface with Discrete Phase Shift in Static Environment.pdf (831.86 kB)
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Secret Key Generation Assisted by Intelligent Reflecting Surface with Discrete Phase Shift in Static Environment

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posted on 2020-11-19, 16:07 authored by Xiaoyan HuXiaoyan Hu, Liang Jin, Kaizhi Huang, Xiaoli Sun, You Zhou
Physical layer secret key generation is a promising candidate to achieve one-time-pad encryption approach for wireless communication system. The main issue of this method is the insufficient secret key rate. Especially in a static environment, the entropy of the channel complex coefficient is limited due to the lack of channel time-variation. To solve the problem, this paper proposes a novel secret key generation scheme assisted by intelligent reflecting surface (IRS) with discrete phase. We construct a dynamic time-varying channel by switching the phase of the reflection elements rapidly and randomly, and use channel estimation samples to update the secret key. Based on the common IRS channel model, we derive the expression of secret key rate. Monte Carlo simulation and numerical results show that the scheme can update secret key even if the channel coefficient is constant, and the secret key rate is higher than schemes based on artificial random signal. In addition, we comprehensively analyze the influence of various factors, such as the number of reflection elements and the IRS switching frequency on the secret key rate.

Funding

National Key Research and Development Program of China under Grant 2017YFB0801903

National Natural Science Foundation of China under Grant 61701538

National Natural Science Foundation of China under Grant 61601514

National Natural Science Foundation of China under Grant 61501516

National Natural Science Foundation of China under Grant 61521003

National Natural Science Foundation of China under Grant 61871404

Doctoral Fund of Ministry of Education of China 2019M663994

History

Email Address of Submitting Author

ndscpls@163.com

ORCID of Submitting Author

https://orcid.org/0000-0002-4312-9889

Submitting Author's Institution

PLA Strategic Support Force Information Engineering University

Submitting Author's Country

  • China

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    Keywords

    wireless communicationphysical layer securitysecret key generationintelligent reflecting surfacesecret key rate

    Licence

    CC BY 4.0

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