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On a security vs privacy trade-off in interconnected dynamical systems

Katewa, V and Anguluri, R and Pasqualetti, F (2021) On a security vs privacy trade-off in interconnected dynamical systems. In: Automatica, 125 .

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Official URL: https://doi.org/10.1016/j.automatica.2020.109426


We study a security problem for interconnected systems, where each subsystem aims to detect local attacks using local measurements and information exchanged with neighboring subsystems. The subsystems also wish to maintain the privacy of their states and, therefore, use privacy mechanisms that share limited or noisy information with other subsystems. We quantify the privacy level based on the estimation error of a subsystem's state and propose a novel framework to compare different mechanisms based on their privacy guarantees. We develop a local attack detection scheme without assuming the knowledge of the global dynamics, which uses local and shared information to detect attacks with provable guarantees. Additionally, we quantify a trade-off between security and privacy of the local subsystems. Interestingly, we show that, for some instances of the attack, the subsystems can achieve a better detection performance by being more private. We provide an explanation for this counter-intuitive behavior and illustrate our results with examples. © 2020 Elsevier Ltd

Item Type: Journal Article
Publication: Automatica
Publisher: Elsevier Ltd
Additional Information: this copyright for this article belongs to Author
Keywords: Dynamical systems, Detection performance; Different mechanisms; Estimation errors; Local measurement; Privacy mechanisms; Security and privacy; Security problems; Shared information, Economic and social effects
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 30 Dec 2021 04:44
Last Modified: 30 Dec 2021 04:44
URI: http://eprints.iisc.ac.in/id/eprint/67674

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