Abstract: In the cyber-physical system, the uncertainty involves various unpredictable factors that the system encounters during operation. It affects the system performance and reliability, increases security threats faced by the system, and makes the system more vulnerable to attacks. Stealthy attacks can successfully bypass the detection of the anomaly detector, and maliciously destroy the control input signal and the sensor measurement signal transmitted via networks, resulting in the deterioration of the system performance. In order to defend against such cyber attacks, the stealth upper bound of the attacks is quantified by using the detection mechanism and the structural information of the attacks, and then an adaptive attack compensator is proposed, such that the controller equipped with the compensator can effectively re-duce the impact of stealth attacks. Finally, simulation results of the flight control system validate the developed control strategy.

Key words: cyber-physical system, uncertainty, stealthy attacks, adaptive control, flight control system