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J. A. Onieva, J. Zhou, and J. Lopez, "Attacking an asynchronous multi-party contract signing protocol",
Proceedings of 6th International Conference on Cryptology in India, LNCS 3797, Springer, pp. 311–321, Decemeber, 2005. More..


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.

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