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Synthesis of Sensor Deception Attacks at the Supervisory Layer of Cyber-Physical Systems

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Document pages: 14 pages

Abstract: We study the security of Cyber-Physical Systems (CPS) in the context of thesupervisory control layer. Specifically, we propose a general model of a CPSattacker in the framework of discrete event systems and investigate the problemof synthesizing an attack strategy for a given feedback control system. Ourmodel captures a class of deception attacks, where the attacker has the abilityto hijack a subset of sensor readings and mislead the supervisor, with the goalof inducing the system into an undesirable state. We utilize a game-likediscrete transition structure, called Insertion-Deletion Attack structure(IDA), to capture the interaction between the supervisor and the environment(which includes the system and the attacker). We show how to use IDAs tosynthesize three different types of successful stealthy attacks, i.e., attacksthat avoid detection from the supervisor and cause damage to the system.

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