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Centralized vs Decentralized Monitors for Hyperproperties

Authors Luca Aceto , Antonis Achilleos , Elli Anastasiadi , Adrian Francalanza , Daniele Gorla , Jana Wagemaker

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Author Details

Luca Aceto
  • Dept. of Computer Science, Reykjavik University, Iceland
  • Gran Sasso Science Institute, L'Aquila, Italy
Antonis Achilleos
  • Dept. of Computer Science, Reykjavik University, Iceland
Elli Anastasiadi
  • Uppsala University, Sweden
Adrian Francalanza
  • University of Malta, Malta
Daniele Gorla
  • Dept. of Computer Science, "Sapienza" University of Rome, Italy
Jana Wagemaker
  • Dept. of Computer Science, Reykjavik University, Iceland

Funding

This work has been supported by the project "Mode(l)s of Verification and Monitorability" (MoVeMent) (grant No 217987) of the Icelandic Research Fund.
  • Anastasiadi, Elli: Elli Anastasiadi’s research has been supported by grant VR 2020-04430 of the Swedish Research Council.

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Luca Aceto, Antonis Achilleos, Elli Anastasiadi, Adrian Francalanza, Daniele Gorla, and Jana Wagemaker. Centralized vs Decentralized Monitors for Hyperproperties. In 35th International Conference on Concurrency Theory (CONCUR 2024). Leibniz International Proceedings in Informatics (LIPIcs), Volume 311, pp. 4:1-4:19, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2024)
https://doi.org/10.4230/LIPIcs.CONCUR.2024.4

Abstract

This paper focuses on the runtime verification of hyperproperties expressed in Hyper-recHML, an expressive yet simple logic for describing properties of sets of traces. To this end, we consider a simple language of monitors that observe sets of system executions and report verdicts w.r.t. a given Hyper-recHML formula. We first employ a unique omniscient monitor that centrally observes all system traces. Since centralised monitors are not ideal for distributed settings, we also provide a language for decentralized monitors, where each trace has a dedicated monitor; these monitors yield a unique verdict by communicating their observations to one another. For both the centralized and the decentralized settings, we provide a synthesis procedure that, given a formula, yields a monitor that is correct (i.e., sound and violation complete). A key step in proving the correctness of the synthesis for decentralized monitors is a result showing that, for each formula, the synthesized centralized monitor and its corresponding decentralized one are weakly bisimilar for a suitable notion of weak bisimulation.

Subject Classification

ACM Subject Classification
  • Theory of computation → Operational semantics
  • Theory of computation → Modal and temporal logics
  • Theory of computation → Logic and verification
Keywords
  • Runtime Verification
  • hyperlogics
  • decentralization

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References

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