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Lookup NU author(s): Dr Jeremy Bryans,
Professor Maciej KoutnyORCiD,
Professor Peter Ryan
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In a previous work, 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 whichto 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.
Author(s): Bryans JW, Koutny M, Ryan PYA
Publication type: Report
Publication status: Published
Series Title: School of Computing Science Technical Report Series
Print publication date: 01/08/2004
Source Publication Date: August 2004
Report Number: 855
Institution: School of Computing Science, University of Newcastle upon Tyne
Place Published: Newcastle upon Tyne