Typing messages for free in security protocols: the~case of equivalence properties
Identifieur interne : 000980 ( Main/Exploration ); précédent : 000979; suivant : 000981Typing messages for free in security protocols: the~case of equivalence properties
Auteurs : Rémy Chrétien [France] ; Véronique Cortier [France] ; Stéphanie Delaune [France]Source :
Abstract
Privacy properties such as untraceability, vote secrecy, or anonymity are typically expressed as behavioural equivalence in a process algebra that models security protocols. In this paper, we study how to decide one particular relation, namely trace equivalence, for an unbounded number of sessions.Our first main contribution is to reduce the search space for attacks. Specifically, we show that if there is an attack then there is one that is well-typed. Our result holds for a large class of typing systems and a large class of determinate security protocols. Assuming finitely many nonces and keys, we can derive from this result that trace equivalence is decidable for an unbounded number of sessions for a class of tagged protocols, yielding one of the first decidability results for the unbounded case.As an intermediate result, we also provide a novel decision procedure in the case of a bounded number of sessions.
Url:
Affiliations:
- France
- Franche-Comté, Grand Est, Lorraine (région)
- Belfort, Besançon, Metz, Nancy
- Université de Bourgogne Franche-Comté, Université de Franche-Comté, Université de Lorraine, Université de technologie de Belfort-Montbéliard
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Le document en format XML
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<orgName type="university">Université de Lorraine</orgName>
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<author><name sortKey="Delaune, Stephanie" sort="Delaune, Stephanie" uniqKey="Delaune S" first="Stéphanie" last="Delaune">Stéphanie Delaune</name>
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<front><div type="abstract" xml:lang="en">Privacy properties such as untraceability, vote secrecy, or anonymity are typically expressed as behavioural equivalence in a process algebra that models security protocols. In this paper, we study how to decide one particular relation, namely trace equivalence, for an unbounded number of sessions.Our first main contribution is to reduce the search space for attacks. Specifically, we show that if there is an attack then there is one that is well-typed. Our result holds for a large class of typing systems and a large class of determinate security protocols. Assuming finitely many nonces and keys, we can derive from this result that trace equivalence is decidable for an unbounded number of sessions for a class of tagged protocols, yielding one of the first decidability results for the unbounded case.As an intermediate result, we also provide a novel decision procedure in the case of a bounded number of sessions.</div>
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<tree><country name="France"><noRegion><name sortKey="Chretien, Remy" sort="Chretien, Remy" uniqKey="Chretien R" first="Rémy" last="Chrétien">Rémy Chrétien</name>
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