Modelling dynamic opacity using Petri Nets with silent actions

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

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

    18 Citations (Scopus)


    In a previous work, [1], we presented a Petri Net based framework in which various confidentiality properties may be expressed in terms of predicates over system state and abstraction mappings from the reachable states and transitions of the underlying Petri Net. Here we extend that work by generalising these mappings by allowing them to be state dependent. This provides a natural framework in which to model various situations of importance in security, for example key compromise and refresh, downgrading of secrecy labels and conditional anonymity. We also show how global changes in the abstraction mappings can be used to model how some secrecy requirements depend on the status of the observer. We illustrate this by modelling the various flavours of anonymity that arise in the dining cryptographers example.

    A further development on the earlier work is to provide a more complete treatment of silent actions. We also discuss the expressiveness of the resulting framework and the decidability of the associated verification problems.1

    Original languageEnglish
    Title of host publicationFormal Aspects in Security and Trust
    EditorsTheo Dimitrakos, Fabio Martinelli
    Place of PublicationBoston
    PublisherSpringer Verlag
    Number of pages14
    ISBN (Electronic)978-0-387-24098-5
    ISBN (Print)978-0-387-24050-3
    Publication statusPublished - 2005
    EventIFIP World Computer Congress - Toulouse, France
    Duration: 22 Aug 200427 Aug 2004
    Conference number: 18

    Publication series

    NameIFIP International Federation for Information Processing (IFIPAICT)


    ConferenceIFIP World Computer Congress
    Abbreviated titleIFIP WCC
    Internet address


    • opacity
    • non-deducibility
    • anonymity
    • Petri nets
    • observable behaviour
    • silent actions


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