A state-feedback watermarking signal design for the detection of replay attacks in linear systems is proposed. The control input is augmented with a random time-delayed term of the system state estimate, in order to secure the system against attacks of replay type. We outline the basic analysis of the closed-loop response of the state-feedback watermarking in a LQG controlled system. Our theoretical results are applied on a temperature process control example. While the proposed secure control scheme requires very involved analysis, it, nevertheless, holds promise of being superior to conventional, feed-forward, watermarking schemes, in both its ability to detect attacks as well as the secured system performance.
@article{arxiv.2404.00850,
title = {Delay-Induced Watermarking for Detection of Replay Attacks in Linear Systems},
author = {Christoforos Somarakis and Raman Goyal and Erfaun Noorani and Shantanu Rane},
journal= {arXiv preprint arXiv:2404.00850},
year = {2024}
}
Comments
6 pages, 3 figures, manuscript to appear in the 2024 American Control Conference