Automatic Analysis of the Security of XOR-based Key Management Schemes.
Identifieur interne : 004992 ( Main/Exploration ); précédent : 004991; suivant : 004993Automatic Analysis of the Security of XOR-based Key Management Schemes.
Auteurs : Véronique Cortier [France] ; Keighren Gavin [Royaume-Uni] ; Graham Steel [Royaume-Uni]Source :
Abstract
We describe a new algorithm for analysing security protocols that use XOR, such as key-management APIs. As a case study, we consider the IBM4758 CCA API, which is widely used in the ATM(cash machine) network. Earlier versions of the CCA API were shown to have serious flaws, and the fixes introduced by IBM in version 2.41 had not previously been formally analysed. We first investigate IBM's proposals using a model checker for security protocol analysis, uncovering some important issues about their implementation. Having identified configurations we believed to be safe, we describe the formal verification of their security. We first define a new class of protocols, containing in particular all the versions of the CCA API. We then show that secrecy after an unbounded number of sessions is decidable for this class. Implementing the decision procedure requires some improvements, since the procedure is exponential. We describe a change of representation that leads to an implementation able to verify a configuration of the API in a few seconds. As a consequence, we obtain the first security proof of the fixed IBM 4758 CCA API with unbounded sessions.
Url:
Affiliations:
- France, Royaume-Uni
- Franche-Comté, Grand Est, Lorraine (région), Écosse
- Belfort, Besançon, Nancy, Édimbourg
- Institut national polytechnique de Lorraine, Université Nancy 2, Université d'Édimbourg, 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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As a case study, we consider the IBM4758 CCA API, which is widely used in the ATM(cash machine) network. Earlier versions of the CCA API were shown to have serious flaws, and the fixes introduced by IBM in version 2.41 had not previously been formally analysed. We first investigate IBM's proposals using a model checker for security protocol analysis, uncovering some important issues about their implementation. Having identified configurations we believed to be safe, we describe the formal verification of their security. We first define a new class of protocols, containing in particular all the versions of the CCA API. We then show that secrecy after an unbounded number of sessions is decidable for this class. Implementing the decision procedure requires some improvements, since the procedure is exponential. We describe a change of representation that leads to an implementation able to verify a configuration of the API in a few seconds. As a consequence, we obtain the first security proof of the fixed IBM 4758 CCA API with unbounded sessions.</div></front></TEI><affiliations><list><country><li>France</li><li>Royaume-Uni</li></country><region><li>Franche-Comté</li><li>Grand Est</li><li>Lorraine (région)</li><li>Écosse</li></region><settlement><li>Belfort</li><li>Besançon</li><li>Nancy</li><li>Édimbourg</li></settlement><orgName><li>Institut national polytechnique de Lorraine</li><li>Université Nancy 2</li><li>Université d'Édimbourg</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="France"><region name="Grand Est"><name sortKey="Cortier, Veronique" sort="Cortier, Veronique" uniqKey="Cortier V" first="Véronique" last="Cortier">Véronique Cortier</name></region></country><country name="Royaume-Uni"><region name="Écosse"><name sortKey="Gavin, Keighren" sort="Gavin, Keighren" uniqKey="Gavin K" first="Keighren" last="Gavin">Keighren Gavin</name></region><name sortKey="Steel, Graham" sort="Steel, Graham" uniqKey="Steel G" first="Graham" last="Steel">Graham Steel</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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