Observer Design Based Cyber Security for Cyber Physical Systems

In this paper, an observer based cyber-attack detection and estimation methodology for cyber physical systems is presented. The cyber-attack is considered to influence the physical part of the cyber physical system that compromises human safety. The cyber-attacks are considered to affect the sensors and the actuators in the sub-systems as well as the software programs of the control systems in the cyber physical system. The whole system is modeled as a hybrid system to incorporate the discrete and continuous part of the cyber physical system and a sliding mode based observer is designed for the detection of these cyber-attacks. For simulation purposes, this paper considers different cyber-attacks on the battery sub-system of modern automobiles and the simulation results of attack detection are presented in the paper.