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L. Wilke, O. Dobe, E. Abraham, E. Bartocci, B. Bonakdarpour:
"Probabilistic Hyperproperties with Rewards";
Talk: Proc. of NFM 2022: the 13th International Symposium of NASA Formal Methods, Pasadena, California, USA; 2022-05-24 - 2022-05-27; in: "Proc. of NFM 2022: the 13th International Symposium of NASA Formal Methods", (2022), 25 pages.

Probabilistic hyperproperties describe system properties that are concerned with the probability relation between di?erent system executions. Likewise, it is desirable to relate performance metrics (e.g., energy, execution time, etc) between multiple runs. This paper introduces the notion of rewards to the temporal logic HyperPCTL by extending the syntax and semantics of the logic to express the accumulated reward relation among di?erent computations. We demonstrate the application of the extended logic in expressing side-channel timing countermeasures, recovery time in distributed self-stabilizing systems, e?ciency in probabilistic conformance, and path planning in robotics applications. We also propose a model checking algorithm for verifying Markov decision processes against HyperPCTL with rewards and report experimental results.