Unfairness of a protocol for certified delivery

@article{Tapiador2005UnfairnessOA,
  title={Unfairness of a protocol for certified delivery},
  author={Juan E. Tapiador and Almudena Alcaide},
  journal={IACR Cryptology ePrint Archive},
  year={2005},
  volume={2005},
  pages={40}
}
Recently, Nenadić 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. 

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