A Cryptographic Model for Branching Time Security Properties -- the Case of Contract Signing Protocols.
Identifieur interne : 004764 ( Main/Exploration ); précédent : 004763; suivant : 004765A Cryptographic Model for Branching Time Security Properties -- the Case of Contract Signing Protocols.
Auteurs : Véronique Cortier [France] ; Ralf Kuesters [Suisse] ; Bogdan Warinschi [Royaume-Uni]Source :
Abstract
Some cryptographic tasks, such as contract signing and other related tasks, need to ensure complex, branching time security properties. When defining such properties one needs to deal with subtle problems regarding the scheduling of non-deterministic decisions, the delivery of messages sent on resilient (non-adversarially controlled) channels, fair executions (executions where no party, both honest and dishonest, is unreasonably precluded to perform its actions), and defining strategies of adversaries against all possible non-deterministic choices of parties and arbitrary delivery of messages via resilient channels. These problems are typically not addressed in cryptographic models and these models therefore do not suffice to formalize branching time properties, such as those required of contract signing protocols. In this paper, we develop a cryptographic model that deals with all of the above problems. One central feature of our model is a general definition of fair scheduling which not only formalizes fair scheduling of resilient channels but also fair scheduling of actions of honest and dishonest principals. Based on this model and the notion of fair scheduling, we provide a definition of a prominent branching time property of contract signing protocols, namely balance, and give the first cryptographic proof that the Asokan-Shoup-Waidner two-party contract signing protocol is balanced.
Url:
Affiliations:
- France, Royaume-Uni, Suisse
- Canton de Zurich, Franche-Comté, Grand Est, Lorraine (région)
- Belfort, Besançon, Nancy, Zurich
- Institut national polytechnique de Lorraine, Université Nancy 2, Université de Bourgogne Franche-Comté, Université de Franche-Comté, Université de Lorraine, Université de technologie de Belfort-Montbéliard, École polytechnique fédérale de Zurich
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When defining such properties one needs to deal with subtle problems regarding the scheduling of non-deterministic decisions, the delivery of messages sent on resilient (non-adversarially controlled) channels, fair executions (executions where no party, both honest and dishonest, is unreasonably precluded to perform its actions), and defining strategies of adversaries against all possible non-deterministic choices of parties and arbitrary delivery of messages via resilient channels. These problems are typically not addressed in cryptographic models and these models therefore do not suffice to formalize branching time properties, such as those required of contract signing protocols. In this paper, we develop a cryptographic model that deals with all of the above problems. One central feature of our model is a general definition of fair scheduling which not only formalizes fair scheduling of resilient channels but also fair scheduling of actions of honest and dishonest principals. Based on this model and the notion of fair scheduling, we provide a definition of a prominent branching time property of contract signing protocols, namely balance, and give the first cryptographic proof that the Asokan-Shoup-Waidner two-party contract signing protocol is balanced.</div></front></TEI><affiliations><list><country><li>France</li><li>Royaume-Uni</li><li>Suisse</li></country><region><li>Canton de Zurich</li><li>Franche-Comté</li><li>Grand Est</li><li>Lorraine (région)</li></region><settlement><li>Belfort</li><li>Besançon</li><li>Nancy</li><li>Zurich</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><li>École polytechnique fédérale de Zurich</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="Suisse"><region name="Canton de Zurich"><name sortKey="Kuesters, Ralf" sort="Kuesters, Ralf" uniqKey="Kuesters R" first="Ralf" last="Kuesters">Ralf Kuesters</name></region></country><country name="Royaume-Uni"><noRegion><name sortKey="Warinschi, Bogdan" sort="Warinschi, Bogdan" uniqKey="Warinschi B" first="Bogdan" last="Warinschi">Bogdan Warinschi</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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