Abstract
This paper describes how to design and implement a mechanism that helps to mitigate sensor attacks on industrial control systems. The proposed architecture is based on concepts from fault-tolerant control techniques. This short note explains how a Kalman filter can be used simultaneously with optimal disturbance decoupling observers to improve the performance of the mitigation mechanism for sensor attacks in cyber-physical control systems. Our proposal mitigates attacks by generating a signal that compensates the change provoked by the attacker, while at the same time reducing the number of false alarms. We demonstrate the effectiveness of our proposal using a three tanks control simulation.
Highlights
Widespread growth of new computing and network technologies has permeated industrial control systems (ICS), facilitating the pervasive use of remote sensors, and their interconnection with centralized control systems
It is important to mention that fault-tolerant control (FTC) technology is being used as a tool for dealing with cyber-attacks [16], [17]; even these works that leverage the fault-tolerant literature focus on detection and isolation, mainly using unknown input observers (UIOs), they do not state how to mitigate these attacks
SIMULATION RESULTS we show some results from applying the mitigation mechanism proposed in Section III to an existing feedback control system which faces false data injection attacks
Summary
Widespread growth of new computing and network technologies has permeated industrial control systems (ICS), facilitating the pervasive use of remote sensors, and their interconnection with centralized control systems. It is important to mention that fault-tolerant control (FTC) technology is being used as a tool for dealing with cyber-attacks [16], [17]; even these works that leverage the fault-tolerant literature focus on detection and isolation, mainly using unknown input observers (UIOs), they do not state how to mitigate these attacks. Motivated by this gap in the literature, our previous work looked at the few proposals that focused on response to cyberattacks and identified two types of responses: (i) preventive and (ii) reactive [18].
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