Opacity generalised to transition systems

Jeremy W. Bryans, Maciej Koutny, Laurent Mazaro, Peter Y.A. Ryan

    Research output: Chapter in Book/Report/Conference proceedingConference proceedingpeer-review

    58 Citations (Scopus)


    Recently, opacity has proved a promising technique for describing security properties. Much of the work has been couched in terms of Petri nets. Here, we extend the notion of opacity to the model of labelled transition systems and generalise opacity in order to better represent concepts from the literature on information flow. In particular, we establish links between opacity and the information flow concepts of anonymity and non-inference. We also investigate ways of verifying opacity when working with Petri nets. Our work is illustrated by two examples, one describing anonymity in a commercial context, and the other modelling requirements upon a simple voting system.
    Original languageEnglish
    Title of host publicationFormal Aspects in Security and Trust
    EditorsTheo Dimitrakos, Fabio Martinelli, Peter Y. A. Ryan, Steve Schneider
    Place of PublicationBerlin
    PublisherSpringer Verlag
    Number of pages15
    Volume3866 LNCS
    ISBN (Electronic)978-3-540-32629-8
    ISBN (Print)978-3-540-32628-1
    Publication statusPublished - 2006
    EventInternational Workshop on Formal Aspects in Security and Trust - Newcastle upon Tyne, United Kingdom
    Duration: 18 Jul 200519 Jul 2005
    Conference number: 3

    Publication series

    NameLecture Notes in Computer Science (LNCS)


    WorkshopInternational Workshop on Formal Aspects in Security and Trust
    Abbreviated titleFAST
    Country/TerritoryUnited Kingdom
    CityNewcastle upon Tyne
    Internet address


    • opacity
    • non-deducibility
    • anonymity
    • non-inference
    • Petri nets
    • observable behaviour
    • labelled transition systems


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