Optimal Chi-squared Detector of Replay Attacks on Cyber-Physical Systems

Patel, Aaqib and Khan, Mohammed Zafar Ali (2021) Optimal Chi-squared Detector of Replay Attacks on Cyber-Physical Systems. In: 9th International Conference on Systems and Control, ICSC 2021, 24 November 2021through 26 November 2021, Caen.

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Abstract

Cyber-physical systems are prone to various security threats. Systems must be equipped with robust detection strategies to ensure timely detection of attacks. One such detection strategy proposes adding a random authentication signal to the optimal control signal and uses a chi-squared failure detector on the residues of measurements to detect the attacks. In this paper, we design the authentication signal's covariance matrix to optimize the performance of the chi-squared detector. The covariance matrix is a unit rank matrix and is an outer product of a well-defined vector. This structure maximizes the probability of correctly detecting an attack while maintaining the probability of false alarm in the chi-squared detector. We corroborate our analytical results by employing simulations. The optimal chi-squared setting demonstrates significant performance gain arbitrary settings. © 2021 IEEE.

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IITH Creators:

IITH Creators	ORCiD
Khan, Mohammed Zafar Ali	https://orcid.org/0000-0002-5880-4023

Item Type:

Conference or Workshop Item (Paper)

Uncontrolled Keywords:

Chi-Squared; Control signal; Covariance matrices; Detection of attacks; Failure Detectors; Optimal controls; Replay attack; Robust detection; Security threats; Signal covariance

Subjects:

Electrical Engineering

Divisions:

Department of Electrical Engineering

Depositing User:

. LibTrainee 2021

Date Deposited:

12 Sep 2022 11:04

Last Modified:

12 Sep 2022 11:04

URI:

http://raiithold.iith.ac.in/id/eprint/10547