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HIOA-CPS: Combining Hybrid Input-Output Automaton and Game Theory for Security Modeling of Cyber-Physical Systems

A Cyber-Physical System (CPS) is usually composed of subnetworks where each subnetwork is under ownership of one defender. Security threats on such CPS can be represented by an attack graph where the defenders are required to invest wisely their limited budget in order to protect their critical assets from being compromised. We model such CPS using hybrid input/output automaton (HIOA) where each subnetwork is represented by a HIOA module. We first establish the building blocks needed in our setting. We then present our model that characterizes the continuous time evolution of the investments and discrete transitions between different system’s states (where each state represents a different condition within the system). Finally, we provide a representative real-world CPS to validate our modeling and show its benefit for CPS security.