International Association for Cryptologic Research

International Association
for Cryptologic Research

CryptoDB

Almudena Alcaide

Publications

Year
Venue
Title
2005
EPRINT
Unfairness of a protocol for certified delivery
Juan M. Estévez-Tapiador Almudena Alcaide
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.