Optimistic Non-repudiation Protocol Analysis

Judson Santos Santiago (1) , Laurent Vigneron (1)

1 CASSIS - Combination of approaches to the security of infinite states systems

Non-repudiation protocols with session labels have a number of vulnerabilities. Recently Cederquist, Corin and Dashti have proposed an optimistic non-repudiation protocol that avoids altogether the use of session labels. We have specified and analysed this protocol using an extended version of the AVISPA Tool and one important fault has been discovered. We describe the protocol, the analysis method, show two attack traces that exploit the fault and propose a correction to the protocol.

Domaines: Cryptographie et sécurité [cs.CR]; Logique en informatique [cs.LO]

Judson Santos Santiago, Laurent Vigneron. Optimistic Non-repudiation Protocol Analysis. Information Security Theory and Practices - Smart Cards, Mobile and Ubiquitous Computing Systems, May 2007, Heraklion, Greece. pp.90-101, ⟨10.1007/978-3-540-72354-7_8⟩. ⟨inria-00176333⟩