Visible to the public Metrics to Enhance the Resilience of Cyber-Physical Systems

TitleMetrics to Enhance the Resilience of Cyber-Physical Systems
Publication TypeConference Paper
Year of Publication2020
AuthorsBarbeau, Michel, Cuppens, Frédéric, Cuppens, Nora, Dagnas, Romain, Garcia-Alfaro, Joaquin
Conference Name2020 IEEE 19th International Conference on Trust, Security and Privacy in Computing and Communications (TrustCom)
Date PublishedJan. 2021
ISBN Number978-1-6654-0392-4
KeywordsAttack Remediation, composability, compositionality, Computing Theory, Computing Theory and Resilience, control theory, covert attacks, CPS Resilience, cyber physical systems, Cyber-physical systems, Cyber-Resilience, diversity reception, Hardware, Monitoring, pubcrawl, Recoverability, Redundancy, resilience, Resiliency, security metrics, Software
AbstractWe focus on resilience towards covert attacks on Cyber-Physical Systems (CPS). We define the new k-steerability and l-monitorability control-theoretic concepts. k-steerability reflects the ability to act on every individual plant state variable with at least k different groups of functionally diverse input signals. l-monitorability indicates the ability to monitor every individual plant state variable with £ different groups of functionally diverse output signals. A CPS with k-steerability and l-monitorability is said to be (k, l)-resilient. k and l, when both greater than one, provide the capability to mitigate the impact of covert attacks when some signals, but not all, are compromised. We analyze the influence of k and l on the resilience of a system and the ability to recover its state when attacks are perpetrated. We argue that the values of k and l can be augmented by combining redundancy and diversity in hardware and software techniques that apply the moving target paradigm.
Citation Keybarbeau_metrics_2020