Alcaide, Almudena and Estevez Tapiador, Juan and Hernandez-Castro, Julio C. and Ribagorda, Arturo (2008) Cryptanalysis of Syverson's Rational Exchange Protocol. International Journal of Network Security, 7 (2). pp. 151-156. ISSN 2152-5064.
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The notion of rational exchange introduced by Syverson in 1998 is a particularly interesting alternative when an eﬃcient scheme for fair exchange is required but the existence of a trusted third party simply cannot be assumed. A rational exchange protocol cannot provide true fairness, but it ensures that rational –i.e. self-interested– parties would have no reason to deviate from the protocol. In this paper, we identify some weaknesses in Syverson’s rational exchange protocol which were neither detected by the original author nor by subsequent analysis. After presenting some attacks, we indicate how the scheme should be modiﬁed to overcome these vulnerabilities. We also provide a formal analysis of our enhancement using BAN logic.
|Uncontrolled keywords:||Cryptanalysis, fair exchange, rational exchange, replay attacks|
|Subjects:||Q Science > QA Mathematics (inc Computing science) > QA 75 Electronic computers. Computer science|
|Divisions:||Faculties > Science Technology and Medical Studies > School of Computing > Security Group|
|Depositing User:||Julio Hernandez-Castro|
|Date Deposited:||24 Oct 2012 13:29|
|Last Modified:||18 Mar 2013 16:22|
|Resource URI:||http://kar.kent.ac.uk/id/eprint/31956 (The current URI for this page, for reference purposes)|
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