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Paper: Unfairness of a protocol for certified delivery

Authors: Juan M. Estévez-Tapiador Almudena Alcaide URL: http://eprint.iacr.org/2005/040 Search ePrint Search Google Recently, Nenadi\'c \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.
BibTeX
@misc{eprint-2005-12378,
title={Unfairness of a protocol for certified delivery},
booktitle={IACR Eprint archive},
keywords={cryptographic protocols / fair exchange; non-repudiation; attacks},
url={http://eprint.iacr.org/2005/040},
note={Technical report jestevez@inf.uc3m.es 12830 received 15 Feb 2005, last revised 16 Feb 2005},
author={Juan M. Estévez-Tapiador and Almudena Alcaide},
year=2005
}