The cyber system is then analyzed using network and data flow models to develop the attack scenarios that may lead to the identified hazards. A mathematical model is derived for the physical system using a hybrid automaton to enumerate potential hazardous states of the system. The paper presents an integrated approach to analyze and design the cyber security system for a given CPS where the physical threats are identified first to guide the risk assessment process. In addition, the process is rich in terms of hazardous scenarios that could be triggered by cyber attacks due to the lack of possible mechanical protection. CSTR is a fundamental process unit in many industries, including Oil & Gas, Petrochemicals, Water treatment, and nuclear industry. The testbed monitors and controls an exothermic Continuous Stirred Tank Reactor (CSTR) simulated in real-time. In this work, we develop and test an integrated model-based approach for CPS security risk assessment utilizing a CPS testbed with real-world industrial controllers and communication protocols. Traditional techniques for Cyber-Physical Systems (CPS) security design either treat the cyber and physical systems independently, or do not address the specific vulnerabilities of real time embedded controllers and networks used to monitor and control physical processes.
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May 2023
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