Compositional Analysis of Contract Signing Protocols
Identifieur interne : 005C37 ( Main/Merge ); précédent : 005C36; suivant : 005C38Compositional Analysis of Contract Signing Protocols
Auteurs : Michael Backes [Suisse] ; Anupam Datta [États-Unis] ; Ante Derek [États-Unis] ; John C. Mitchell [États-Unis] ; Mathieu Turuani [France]Source :
Abstract
We develop a general method for reasoning about contract-signing protocols using a specialized protocol logic. The method is applied to prove properties of the Asokan-Shoup-Waidner and the Garay-Jacobson-MacKenzie protocols. Our method offers certain advantages over previous analysis techniques. First, it is compositional: the security guarantees are proved by combining the independent proofs for the three subprotocols of which each protocol is comprised. Second, the formal proofs are carried out in a ``template'' form, which gives us a reusable proof that may be instantiated for the ASW and GJM protocols, as well as for other protocols with the same arrangement of messages. Third, the proofs follow the design intuition. In particular, in proving game-theoretic properties like \emph{fairness}, we demonstrate that the specific strategy that the protocol designer had in mind works, instead of showing that one exists. Finally, our results hold even when an unbounded number of sessions are executed in parallel.
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<country>France</country>
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<region type="old region" nuts="2">Lorraine (région)</region>
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<orgName type="university">Université Nancy 2</orgName>
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<orgName type="university">Institut national polytechnique de Lorraine</orgName>
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<placeName><settlement type="city" wicri:auto="siege">Besançon</settlement>
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<orgName type="university">Université de Franche-Comté</orgName>
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<front><div type="abstract" xml:lang="en">We develop a general method for reasoning about contract-signing protocols using a specialized protocol logic. The method is applied to prove properties of the Asokan-Shoup-Waidner and the Garay-Jacobson-MacKenzie protocols. Our method offers certain advantages over previous analysis techniques. First, it is compositional: the security guarantees are proved by combining the independent proofs for the three subprotocols of which each protocol is comprised. Second, the formal proofs are carried out in a ``template'' form, which gives us a reusable proof that may be instantiated for the ASW and GJM protocols, as well as for other protocols with the same arrangement of messages. Third, the proofs follow the design intuition. In particular, in proving game-theoretic properties like \emph{fairness}, we demonstrate that the specific strategy that the protocol designer had in mind works, instead of showing that one exists. Finally, our results hold even when an unbounded number of sessions are executed in parallel.</div>
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