Model Reconstruction via Hieralchical Supervisory Control with Cyber Attacks

Control systems, which are becoming more and more IoT-oriented, require system design and operation subject to cyber-attacks. In other words, a degenerate but safe operation is required even under cyber-attacks. The purpose of this study is to design an attack model and a degenerate operation model. The challenge in the attacked situation is that the controllable parts of the controlled object (plant) differ between the normal control and the attacker’s control. To address this issue, this study uses hierarchical supervisory control. We reconstruct the plant model considering the controllability of the attacker and design a degenerate operation model. We show that the degenerate operation model can be designed as a defensive measure based on the controllability of the attacker in the event of a cyber-attack. Furthermore, the designed degenerate operation model was found to be controllable by simulation..