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On the security of fair non-repudiation protocols

: Gürgens, S.; Rudolph, C.; Vogt, H.


International journal of information security 4 (2005), No.4, pp.253-262
ISSN: 1615-5262
ISSN: 1615-5270
Journal Article
Fraunhofer SIT ()

We analyzed two non-repudiation protocols and found some new attacks on the fairness and termination property of these protocols. Our attacks are enabled by several inherent design weaknesses, which also apply to other non-repudiation protocols. To prevent these attacks, we propose generic countermeasures that considerably strengthen the design and implementation of non-repudiation protocols. The application of these countermeasures is finally shown by our construction of a new fair non-repudiation protocol.