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Hunter, Aaron ; Delgrande, James

Belief Change and Cryptographic Protocol Verification

07351.DelgrandeJames.Paper.1206.pdf (0.2 MB)


Cryptographic protocols are structured sequences of messages that are used for exchanging information in a hostile environment. Many protocols have epistemic goals: a successful run of the protocol is intended to cause a participant to hold certain beliefs. As such, epistemic logics have been employed for the verification of cryptographic protocols. Although this approach to verification is explicitly concerned with changing beliefs, formal belief change operators have not been incorporated in previous work. In this paper, we introduce a new approach to protocol verification by combining a monotonic logic with a non-monotonic belief change operator. In this context, a protocol participant is able to retract beliefs in response to new information and a protocol participant is able to postulate the most plausible event explaining new information. We illustrate that this kind of reasoning is particularly important when protocol participants have incorrect beliefs.

BibTeX - Entry

  author =	{Aaron Hunter and James Delgrande},
  title =	{Belief Change and Cryptographic Protocol Verification},
  booktitle =	{Formal Models of Belief Change in Rational Agents},
  year =	{2007},
  editor =	{Giacomo Bonanno and James Delgrande and J{\'e}r{\^o}me Lang and Hans Rott},
  number =	{07351},
  series =	{Dagstuhl Seminar Proceedings},
  ISSN =	{1862-4405},
  publisher =	{Internationales Begegnungs- und Forschungszentrum f{\"u}r Informatik (IBFI), Schloss Dagstuhl, Germany},
  address =	{Dagstuhl, Germany},
  URL =		{},
  annote =	{Keywords: Belief change, belief evolution, cryptographic protocol verification}

Keywords: Belief change, belief evolution, cryptographic protocol verification
Seminar: 07351 - Formal Models of Belief Change in Rational Agents
Issue Date: 2007
Date of publication: 20.11.2007

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