2026-07-22T14:19:58Z https://drops.dagstuhl.de/oai

oai:drops-oai.dagstuhl.de:17093 2024-03-06T10:58:44Z ddc:004 open_access

Diamonds for Security: A Non-Interleaving Operational Semantics for the Applied Pi-Calculus Aubert, Clément Horne, Ross Johansen, Christian Security Processes Structural operational semantics Asynchronous transition systems Applied pi-calculus We introduce a non-interleaving structural operational semantics for the applied π-calculus and prove that it satisfies the properties expected of a labelled asynchronous transition system (LATS). LATS have well-studied relations with other standard non-interleaving models, such as Mazurkiewicz traces or event structures, and are a natural extension of labelled transition systems where the independence of transitions is made explicit. We build on a considerable body of literature on located semantics for process algebras and adopt a static view on locations to identify the parallel processes that perform a transition. By lifting, in this way, work on CCS and π-calculus to the applied π-calculus, we lay down a principled foundation for reusing verification techniques such as partial-order reduction and non-interleaving equivalences in the field of security. The key technical device we develop is the notion of located aliases to refer unambiguously to a specific output originating from a specific process. This light mechanism ensures stability, avoiding disjunctive causality problems that parallel extrusion incurs in similar non-interleaving semantics for the π-calculus. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Clément Aubert and Ross Horne and Christian Johansen 2022 Is Part Of LIPIcs, Volume 243, 33rd International Conference on Concurrency Theory (CONCUR 2022) InProceedings Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/LIPIcs.CONCUR.2022.30 urn:nbn:de:0030-drops-170930 https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2022.30 eng https://creativecommons.org/licenses/by/4.0/legalcode