Protecting Physical Layer Secret Key Generation From Active Attacks - Archive ouverte HAL
Article Dans Une Revue Entropy Année : 2021

Protecting Physical Layer Secret Key Generation From Active Attacks

Résumé

Lightweight session key agreement schemes are expected to play a central role in building Internet of things (IoT) security in sixth generation (6G) networks. A well-established approach coming from the physical layer is secret key generation (SKG) from shared randomness (in the form of wireless fading coefficients). However, although practical, SKG schemes have been shown to be vulnerable to active attacks over the initial ``advantage distillation'' phase, throughout which estimates of the fading coefficients are obtained at the legitimate users. In fact, by injecting carefully designed signals during this phase, a man-in-the-middle (MiM) could manipulate and control part of the reconciled bits and thus render SKG vulnerable to brute force attacks. Alternatively, a denial of service attack can be mounted by a reactive jammer. In this paper we investigate the impact of injection and jamming attacks during the advantage distillation in a multiple input multiple output (MIMO) system. First, we show that a MiM attack can be mounted as long as the attacker has one extra antenna with respect to the legitimate users and we propose a pilot randomization scheme that allows the legitimate users to successfully reduce the injection attack to a less harmful jamming attack. Secondly, by taking a game-theoretic approach we evaluate the optimal strategies available to the legitimate users in the presence of reactive jammers
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Dates et versions

hal-03833914 , version 1 (28-10-2022)

Identifiants

Citer

Miroslav Mitev, Arsenia Chorti, E Veronica Belmega, Vincent Poor. Protecting Physical Layer Secret Key Generation From Active Attacks. Entropy, 2021, 23 (8), pp.960. ⟨10.3390/e23080960⟩. ⟨hal-03833914⟩
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