Intelligent Reflecting Surface-Assisted Wireless Key Generation for Low-Entropy Environments

Staat, Paul; Elders–Boll, H.; Heinrichs, Markus; Kronberger, Rainer; Zenger, Christian; Paar, Christof

doi:10.48550/arxiv.2010.06613

Cited by 2 publications

(2 citation statements)

References 14 publications

(21 reference statements)

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“…The legitimate Alice and Bob (with singleantenna) aim to generate secret key relying on the reciprocal channel between them. Here, we assume that the direct channels between Alice and Bob are LoS-dominated, and hence an RIS (an uniform planar array with M ∈ N + elements) is deployed to generate the randomness by randomly shifting its reflecting phases [14]- [17].…”

Section: Ris-secured Los Channel Modelmentioning

confidence: 99%

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

Wei

Guo

2022

IEEE Commun. Lett.

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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 RIScombined legitimate channel. We further deduce a closed-form secret key leakage rate under our designed multi-Eve scheme, and demonstrate the results via simulations.

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Section: Ris-secured Los Channel Modelmentioning

confidence: 99%

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

Wei

Guo

2022

IEEE Commun. Lett.

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“…For comparison, we select the RSS based PL-SKG in [36], [37], using the globally known pilot and LS for channel estimation. Here, we abbreviate it as the pilot based PL-SKG.…”

Section: Numerical Simulationsmentioning

confidence: 99%

Random Matrix based Physical Layer Secret Key Generation in Static Channels

Wei¹,

Guo²

2021

Preprint

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Physical layer secret key generation exploits the reciprocal channel randomness for key generation and has proven to be an effective addition security layer in wireless communications. However, static or scarcely random channels require artificially induced dynamics to improve the secrecy performance, e.g., using intelligent reflecting surface (IRS). One key challenge is that the induced random phase from IRS is also reflected in the direction to eavesdroppers (Eve). This leakage enables Eve nodes to estimate the legitimate channels and secret key via a globally known pilot sequence. To mitigate the secret key leakage issue, we propose to exploit random matrix theory to inform the design of a new physical layer secret key generation (PL-SKG) algorithm. We prove that, when sending appropriate random Gaussian matrices, the singular values of Alice's and Bob's received signals follow a similar probability distribution. Leveraging these common singular values, we propose a random Gaussian matrix based PL-SKG (RGM PL-SKG), which avoids the usages of the globally known pilot and thereby prevents the aforementioned leakage issue. Our results show the following: (i) high noise resistance which leads to superior secret key rate (SKR) improvement (up to 300%) in low SNR regime, and (ii) general improved SKR performance against multiple colluded Eves. We believe our combination of random matrix theory and PL-SKG shows a new paradigm to secure the wireless communication channels.

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Intelligent Reflecting Surface-Assisted Wireless Key Generation for Low-Entropy Environments

Cited by 2 publications

References 14 publications

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

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

Random Matrix based Physical Layer Secret Key Generation in Static Channels

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