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A method for proving observational equivalence

Identifieur interne : 003488 ( Main/Exploration ); précédent : 003487; suivant : 003489

A method for proving observational equivalence

Auteurs : Véronique Cortier [France] ; Stéphanie Delaune [France]

Source :

RBID : Hal:inria-00426622

Abstract

Formal methods have proved their usefulness for analyzing the security of protocols. Most existing results focus on trace properties like secrecy (expressed as a reachability property) or authentication. There are however several security properties, which cannot be defined (or cannot be naturally defined) as trace properties and require the notion of observational equivalence. Typical examples are anonymity, privacy related properties or statements closer to security properties used in cryptography. In this paper, we consider the applied pi calculus and we show that for determinate processes, observational equivalence actually coincides with trace equivalence, a notion simpler to reason with. We exhibit a large class of determinate processes, called simple processes, that capture most existing protocols and cryptographic primitives. Then, for simple processes without replication nor else branch, we reduce the decidability of trace equivalence to deciding an equivalence relation introduced by M. Baudet. Altogether, this yields the first decidability result of observational equivalence for a general class of equational theories.

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<orgName>École normale supérieure - Cachan</orgName>
<orgName type="acronym">ENS Cachan</orgName>
<desc>
<address>
<addrLine>61, avenue du Président Wilson - 94230 Cachan</addrLine>
<country key="FR"></country>
</address>
<ref type="url">http://www.ens-cachan.fr/</ref>
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</org>
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<org type="institution" xml:id="struct-441569" status="VALID">
<idno type="ISNI">0000000122597504</idno>
<idno type="IdRef">02636817X</idno>
<orgName>Centre National de la Recherche Scientifique</orgName>
<orgName type="acronym">CNRS</orgName>
<date type="start">1939-10-19</date>
<desc>
<address>
<country key="FR"></country>
</address>
<ref type="url">http://www.cnrs.fr/</ref>
</desc>
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<country>France</country>
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<keywords scheme="mix" xml:lang="it">
<term>applied pi calculus</term>
<term>observational equivalence</term>
<term>security protocols</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front>
<div type="abstract" xml:lang="en">Formal methods have proved their usefulness for analyzing the security of protocols. Most existing results focus on trace properties like secrecy (expressed as a reachability property) or authentication. There are however several security properties, which cannot be defined (or cannot be naturally defined) as trace properties and require the notion of observational equivalence. Typical examples are anonymity, privacy related properties or statements closer to security properties used in cryptography. In this paper, we consider the applied pi calculus and we show that for determinate processes, observational equivalence actually coincides with trace equivalence, a notion simpler to reason with. We exhibit a large class of determinate processes, called simple processes, that capture most existing protocols and cryptographic primitives. Then, for simple processes without replication nor else branch, we reduce the decidability of trace equivalence to deciding an equivalence relation introduced by M. Baudet. Altogether, this yields the first decidability result of observational equivalence for a general class of equational theories.</div>
</front>
</TEI>
<affiliations>
<list>
<country>
<li>France</li>
</country>
<region>
<li>Franche-Comté</li>
<li>Grand Est</li>
<li>Lorraine (région)</li>
</region>
<settlement>
<li>Belfort</li>
<li>Besançon</li>
<li>Nancy</li>
</settlement>
<orgName>
<li>Institut national polytechnique de Lorraine</li>
<li>Université Nancy 2</li>
<li>Université de Bourgogne Franche-Comté</li>
<li>Université de Franche-Comté</li>
<li>Université de Lorraine</li>
<li>Université de technologie de Belfort-Montbéliard</li>
</orgName>
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<country name="France">
<region name="Grand Est">
<name sortKey="Cortier, Veronique" sort="Cortier, Veronique" uniqKey="Cortier V" first="Véronique" last="Cortier">Véronique Cortier</name>
</region>
<name sortKey="Delaune, Stephanie" sort="Delaune, Stephanie" uniqKey="Delaune S" first="Stéphanie" last="Delaune">Stéphanie Delaune</name>
</country>
</tree>
</affiliations>
</record>

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