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Propositional Dynamic Logic for Hyperproperties Gutsfeld, Jens Oliver Müller-Olm, Markus Ohrem, Christoph Hyperlogics Hyperproperties Model Checking Automata Information security properties of reactive systems like non-interference often require relating different executions of the system to each other and following them simultaneously. Such hyperproperties can also be useful in other contexts, e.g., when analysing properties of distributed systems like linearizability. Since common logics like LTL, CTL, or the modal μ-calculus cannot express hyperproperties, the hyperlogics HyperLTL and HyperCTL^* were developed to cure this defect. However, these logics are not able to express arbitrary ω-regular properties. In this paper, we introduce HyperPDL-Δ, an adaptation of the Propositional Dynamic Logic of Fischer and Ladner for hyperproperties, in order to remove this limitation. Using an elegant automata-theoretic framework, we show that HyperPDL-Δ model checking is asymptotically not more expensive than HyperCTL^* model checking, despite its vastly increased expressive power. We further investigate fragments of HyperPDL-Δ with regard to satisfiability checking. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Jens Oliver Gutsfeld and Markus Müller-Olm and Christoph Ohrem 2020 Is Part Of LIPIcs, Volume 171, 31st International Conference on Concurrency Theory (CONCUR 2020) InProceedings Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/LIPIcs.CONCUR.2020.50 urn:nbn:de:0030-drops-128628 https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2020.50 eng https://creativecommons.org/licenses/by/3.0/legalcode