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J. A. Onieva, J. Lopez, and J. Zhou, "Secure Multi-Party Non-Repudiation Protocols and Applications",
Advances in Information Security, vol. 43, Springer, 2009. More..
J. Zhou, J. A. Onieva, and J. Lopez, "A Synchronous Multi-Party Contract Signing Protocol Improving Lower Bound of Steps",
21st International Information Security Conference (IFIP SEC’06), no. 201, Springer, pp. 221-232, May, 2006. More..

Abstract

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. A number of two-party contract signing protocols have been proposed with various features. 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 propose a new synchronous multi-party contract signing protocol that, with n parties, it reaches a lower bound of 3(n − 1) steps in the all-honest case and 4n − 2 steps in the worst case (i.e., all parties contact the trusted third party). This is so far the most efficient synchronous multi-party contract signing protocol in terms of the number of messages required. We further consider the additional features like timeliness and abuse-freeness in the improved version.

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