Digitally Tunable Frequency Selective Surface for a Physical Layer Security System in the 5 GHz Wi-Fi Band

Heinrichs, Markus; Kronberger, Rainer

doi:10.23919/isap47053.2021.9391243

Cited by 9 publications

(1 citation statement)

References 2 publications

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“…An onboard microcontroller controls the unit cells by means of cascaded shift registers. The RIS prototype is an evolution of our design from [32], where we used a higher-cost substrate and a smaller array size. Following Section IV, in our experiments we apply random RIS configurations with an update period T r = 1 fr , see right side of Figure . 11.…”

Section: A Experimental Setupmentioning

confidence: 99%

Reconfigurable Intelligent Surface for Physical Layer Key Generation: Constructive or Destructive?

Staat

et al. 2022

IEEE Wireless Commun.

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Channel Reciprocity-based Key Generation (CRKG) exploits reciprocal channel randomness to establish shared secret keys between wireless terminals. This new security technique is expected to complement existing cryptographic techniques for secret key distribution of future wireless networks. In this paper, we present a new attack, reconfigurable intelligent surface (RIS) jamming, and show that an attacker can prevent legitimate users from agreeing on the same key by deploying a malicious RIS to break channel reciprocity. Specifically, we elaborate on three examples to implement the RIS jamming attack: Using active nonreciprocal circuits, performing time-varying controls, and reducing the signal-to-noise ratio. The attack effect is then studied by formulating the secret key rate with a relationship to the deployment of RIS. To resist such RIS jamming attacks, we propose a countermeasure that exploits wideband signals for multipath separation. The malicious RIS path is distinguished from all separated channel paths, and thus the countermeasure is referred to as contaminated path removal-based CRKG (CRP-CRKG). We present simulation results, showing that legitimate users under RIS jamming are still able to generate secret keys from the remaining paths. We also experimentally demonstrate the RIS jamming attack by using commodity Wi-Fi devices in conjunction with a fabricated RIS prototype. In our experiments, we were able to increase the average bit disagreement ratio (BDR) of raw secret keys by 20%. Further, we successfully demonstrate the proposed CRP-CRKG countermeasure to tackle RIS jamming in wideband systems as long as the source of randomness and the RIS propagation paths are separable.

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Section: A Experimental Setupmentioning

confidence: 99%