InforLorV4, Main, Exploration, bibRecord, 001102

Lengths may break privacy -- or how to check for equivalences with length

Identifieur interne : 001102 ( Main/Exploration ); précédent : 001101; suivant : 001103

Lengths may break privacy -- or how to check for equivalences with length

Auteurs : Vincent Cheval [Royaume-Uni] ; Véronique Cortier [France] ; Antoine Plet [France]

Source :

RBID : Hal:hal-00881065

Abstract

Security protocols have been successfully analyzed using symbolic models, where messages are represented by terms and protocols by processes. Privacy properties like anonymity or untraceability are typically expressed as equivalence between processes. While some decision procedures have been proposed for automatically deciding process equivalence, all existing approaches abstract away the information an attacker may get when observing the length of messages. In this paper, we study process equivalence with length tests. We first show that, in the static case, almost all existing decidability results (for static equivalence) can be extended to cope with length tests. In the active case, we prove decidability of trace equivalence with length tests, for a bounded number of sessions and for standard primitives. Our result relies on a previous decidability result from Cheval et al [15] (without length tests). Our procedure has been implemented and we have discovered a new flaw against privacy in the biometric passport protocol.

Url:

https://hal.inria.fr/hal-00881065

DOI: 10.1007/978-3-642-39799-8_50

Affiliations:

Links toward previous steps (curation, corpus...)

to stream Hal, to step Corpus: 002E79
to stream Hal, to step Curation: 002E79
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Le document en format XML

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<front><div type="abstract" xml:lang="en">Security protocols have been successfully analyzed using symbolic models, where messages are represented by terms and protocols by processes. Privacy properties like anonymity or untraceability are typically expressed as equivalence between processes. While some decision procedures have been proposed for automatically deciding process equivalence, all existing approaches abstract away the information an attacker may get when observing the length of messages. In this paper, we study process equivalence with length tests. We first show that, in the static case, almost all existing decidability results (for static equivalence) can be extended to cope with length tests. In the active case, we prove decidability of trace equivalence with length tests, for a bounded number of sessions and for standard primitives. Our result relies on a previous decidability result from Cheval et al [15] (without length tests). Our procedure has been implemented and we have discovered a new flaw against privacy in the biometric passport protocol.</div>
</front>
</TEI>
<affiliations><list><country><li>France</li>
<li>Royaume-Uni</li>
</country>
<region><li>Angleterre</li>
<li>Franche-Comté</li>
<li>Grand Est</li>
<li>Lorraine (région)</li>
<li>Midlands de l'Ouest</li>
</region>
<settlement><li>Belfort</li>
<li>Besançon</li>
<li>Birmingham</li>
<li>Metz</li>
<li>Nancy</li>
</settlement>
<orgName><li>Université de Birmingham</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>
</list>
<tree><country name="Royaume-Uni"><region name="Angleterre"><name sortKey="Cheval, Vincent" sort="Cheval, Vincent" uniqKey="Cheval V" first="Vincent" last="Cheval">Vincent Cheval</name>
</region>
</country>
<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="Plet, Antoine" sort="Plet, Antoine" uniqKey="Plet A" first="Antoine" last="Plet">Antoine Plet</name>
</country>
</tree>
</affiliations>
</record>

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Lengths may break privacy -- or how to check for equivalences with length

Lengths may break privacy -- or how to check for equivalences with length

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