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Cyber LOPA A New Approach for CPS Safety Design in the Presence of Cyber Attacks

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Document pages: 15 pages

Abstract: Safety risk assessment is an essential process to ensure a dependableCyber-Physical Systems (CPS) design. Traditional risk assessment considers onlyphysical failures. For modern CPS, failures caused by cyberattacks are on therise. The focus of latest research effort is on safety-security lifecycleintegration and the expansion of modeling formalism for risk assessment toincorporate security failures. The interaction between safety and security andits impact on the overall system design, as well as the reliability lossresulting from ignoring security failures are some of the overlooked researchquestions. This paper addresses these research questions by presenting a newsafety design method named Cyber Layer Of Protection Analysis (CLOPA) thatextends existing LOPA framework to include failures caused by cyberattacks. Theproposed method provides a rigorous mathematical formulation that expressesquantitatively the tradeoff between designing a highly-reliable versus ahighly-secure CPS. We further propose a co-design lifecycle process thatintegrates the safety and security risk assessment processes. We evaluate theproposed CLOPA approach and the integrated lifecycle on a practical case studyof a process reactor controlled by an industrial control testbed, and provide acomparison between the proposed CLOPA and current LOPA risk assessmentpractice.

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