[Resource Topic] 2005/040: Unfairness of a protocol for certified delivery

Welcome to the resource topic for 2005/040

Unfairness of a protocol for certified delivery

Authors: Juan M. Estevez-Tapiador, Almudena Alcaide


Recently, Nenadić \emph{et al.} (2004) proposed the RSA-CEGD
protocol for certified delivery of e-goods. This is a relatively
complex scheme based on verifiable and recoverable encrypted
signatures (VRES) to guarantee properties such as strong fairness
and non-repudiation, among others. In this paper, we demonstrate how
this protocol cannot achieve fairness by presenting a severe attack
and also pointing out some other weaknesses.

ePrint: https://eprint.iacr.org/2005/040

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