A Framework for Output-Feedback Symbolic Control

Khaled, Mahmoud; Zhang, Kuize

doi:10.48550/arxiv.2011.14848

Cited by 1 publication

(1 citation statement)

References 39 publications

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“…As we discussed, an opacity-enforcing controller is observation-based in general. To address this issue, a possible solution is to use the output-feedback refinement relation (OFRR) [158,90] instead of the ASR. How to suitably generalize the OFRR to preserve opacity is still an open problem.…”

Section: 3mentioning

confidence: 99%

Secure-by-Construction Synthesis of Cyber-Physical Systems

Liu¹,

Trivedi²,

Yin³

2022

Preprint

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Correct-by-construction synthesis is a cornerstone of the confluence of formal methods and control theory towards designing safety-critical systems. Instead of following the time-tested, albeit laborious (re)design-verify-validate loop, correct-by-construction methodology advocates the use of continual refinements of formal requirements-connected by chains of formal proofs-to build a system that assures the correctness by design. A remarkable progress has been made in scaling the scope of applicability of correct-byconstruction synthesis-with a focus on cyber-physical systems that tie discrete-event control with continuous environment-to enlarge control systems by combining symbolic approaches with principled state-space reduction techniques. Unfortunately, in the security-critical control systems, the security properties are verified ex post facto the design process in a way that undermines the correct-by-construction paradigm. We posit that, to truly realize the dream of correct-by-construction synthesis for security-critical systems, security considerations must take center-stage with the safety considerations. Moreover, catalyzed by the recent progress on the opacity sub-classes of security properties and the notion of hyperproperties capable of combining security with safety properties, we believe that the time is ripe for the research community to holistically target the challenge of secure-by-construction synthesis. This paper details our vision by highlighting the recent progress and open challenges that may serve as bricks for providing a solid foundation for secure-by-construction synthesis of cyber-physical systems.The revolution in miniaturized communication devices in the beginning of this millennium contributed towards a revolution in the internet-of-things (IoT) and the networked systems woven around them: the cyber-physical systems (CPS). CPS are marked by a close-knit interaction of discrete computation and continuous control over a network and are playing critical roles in virtually every aspect of our modern experience ranging from consumer electronics to implantable medical devices, from smart cars to smart hospitals, and from controlling our power systems to safeguarding our nuclear rectors. These systems are clearly safety-critical as a bug in their design could be life threatening, but given their societal implications, they are also security-critical where a bug in their design may have the potential to jeopardize the privacy, trust, and economic interests of society built around them." We believe that the security considerations should be elevated as primary design drivers along with safety ones to tackle the design challenge of modern CPS and call for a need to expand the correct-byconstruction paradigm of designing safety-critical systems to encompass security: we call this paradigm secure-by-construction. This paper synthesizes ideas from three research communities: discrete event systems (DES), control systems (CS), and formal methods (FM) to pose and study central problems supporting...

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Section: 3mentioning

confidence: 99%