A Multi-Eavesdropper Scheme Against RIS Secured LoS-Dominated Channel

Wei, Zhuangkun; Guo, Weisi; Li, Bin

Abstract

Reconfigurable intelligent surface (RIS) has been shown as a promising technique to increase the channel randomness for secret key generation (SKG) in low-entropy channels (e.g., static or line-of-sight (LoS)), without small-scale fading. In this letter, we show that even with the aid of RIS, collaborative eavesdroppers (Eves) can still estimate the legitimate Alice-Bob channel and erode their secret key rates (SKRs), since the RIS induced randomness is also reflected in the Eves’ observations. Conditioned on Eves’ observations, if the entropy of RIS-combined legitimate channel is zero, Eves are able to estimate it and its secret key. Leveraging this, we design a multi-Eve scheme against the RIS-secured LoS dominated scenarios, by using the multiple Eves’ observations to reconstruct the RIS-combined legitimate channel. We further deduce a closed-form secret key leakage rate under our designed multi-Eve scheme, and demonstrate the results via simulations.

Citation

Wei, Z., Guo, W., & Li, B. (2022). A Multi-Eavesdropper Scheme Against RIS Secured LoS-Dominated Channel. IEEE Communications Letters, 26(6), 1221-1225. https://doi.org/10.1109/lcomm.2022.3166239

• Journal Article Type: Article
• Online Publication Date: Apr 11, 2022
• Publication Date: 2022-06
• Deposit Date: Feb 12, 2025
• Journal: IEEE Communications Letters
• Print ISSN: 1089-7798
• Electronic ISSN: 1558-2558
• Publisher: Institute of Electrical and Electronics Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 26
• Issue: 6
• Pages: 1221-1225
• DOI: https://doi.org/10.1109/lcomm.2022.3166239
• Public URL: https://durham-repository.worktribe.com/output/3479400