    @inproceedings {Onieva2005a,
	title = {Attacking an asynchronous multi-party contract signing protocol},
	booktitle = {Proceedings of 6th International Conference on Cryptology in India},
	series = {LNCS},
	volume = {3797},
	year = {2005},
	month = {Decemeber},
	pages = {311{\textendash}321},
	publisher = {Springer},
	organization = {Springer},
	abstract = {<p>Contract signing is a fundamental service in doing business. The Internet has facilitated the electronic commerce, and it is necessary to find appropriate mechanisms for contract signing in the digital world. From a designing point of view, digital contract signing is a particular form of electronic fair exchange. Protocols for generic exchange of digital signatures exist. There are also specific protocols for two-party contract signing. Nevertheless, in some applications, a contract may need to be signed by multiple parties. Less research has been done on multi-party contract signing. In this paper, we analyze an optimistic N-party contract signing protocol, and point out its security problem, thus demonstrating further work needs to be done on the design and analysis of secure and optimistic multi-party contract signing protocols.</p>},
	keywords = {multi-party contract signing, Secure electronic commerce, security protocol analysis},
	author = {Jose A. Onieva and Jianying Zhou and Javier Lopez}
}
@article {Onieva2004a,
	title = {Agent-mediated non-repudiation protocols},
	journal = {Electronic Commerce Research and Applications},
	volume = {3},
	number = {2},
	year = {2004},
	pages = {152-162},
	publisher = {Elsevier},
	abstract = {<p>Non-repudiation is a security service that provides cryptographic evidence to support the settlement of disputes in electronic commerce. In commercial transactions, an intermediary (or agent) might be involved to help transacting parties to conduct their business. Nevertheless, such an intermediary may not be fully trusted. In this paper, we propose agent-mediated non-repudiation protocols and analyze their security requirements. We first present a simple scenario with only one recipient, followed by a more complicated framework where multiple recipients are involved and collusion between them is possible. We also identify applications that could take advantage of these agent-mediated non-repudiation protocols.</p>},
	keywords = {Electronic commerce, fair exchange, group communications, Intermediary services, Non repudiation},
	issn = {1567-4223},
	author = {Jose A. Onieva and Jianying Zhou and Javier Lopez and Mildrey Carbonell}
}
