Secure Control of Networked Control Systems Using Dynamic Watermarking

TL;DR

This paper introduces a new dynamic watermarking scheme for secure control of networked control systems, improving attack detection and system resilience against false data injection attacks through theoretical analysis and experimental validation.

Contribution

A novel dynamic watermarking scheme that enhances attack detection and system robustness in networked control systems, addressing limitations of conventional methods.

Findings

Improved FDIA detection capability using additive distortion power analysis.

Positive correlation between watermarking intensity and detection effectiveness.

Experimental validation on a networked inverted pendulum system confirms scheme effectiveness.

Abstract

We here investigate secure control of networked control systems developing a new dynamic watermarking (DW) scheme. Firstly, the weaknesses of the conventional DW scheme are revealed, and the tradeoff between the effectiveness of false data injection attack (FDIA) detection and system performance loss is analysed. Secondly, we propose a new DW scheme, and its attack detection capability is interrogated using the additive distortion power of a closed-loop system. Furthermore, the FDIA detection effectiveness of the closed-loop system is analysed using auto/cross covariance of the signals, where the positive correlation between the FDIA detection effectiveness and the watermarking intensity is measured. Thirdly, the tolerance capacity of FDIA against the closed-loop system is investigated, and theoretical analysis shows that the system performance can be recovered from FDIA using our new DW scheme. Finally, experimental results from a networked inverted pendulum system demonstrate the validity of our proposed scheme.