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Jisuanji gongcheng

New Contract Signing Protocol with Semi-Trusted Third Party

Caifen Wang

Published Jan 1, 2004• 0 citations
OpenAlex

Abstract

Verifiable encryption plays an important role in fair exchange. A new verifiable encryption with blind decryption scheme is given in the paper. Based on the scheme, this paper presents new contract signing protocols with semi-trusted third party. It also outlines a one-to-many version. The protocol is practical and solves an open problem presented by Franklin. It is the first multi-party contract signing protocols with semi-trusted third party.

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Journal of Xidian University•Jan 1, 2004•0 citations
Verifiable encryption plays an important role in fair exchange. A new verifiable encryption with blind decryption scheme is given in the paper. Based on the scheme, this paper presents new contract signing protocols with semi-trusted third party. It also outlines a one-to-many version. The protocol is practical and solves an open problem presented by Franklin. It is the first multi-party contract signing protocols with semi-trusted third party.
Electronic contract signing is an important issue in electronic commerce,while fair electronic contract signing protocol is an application model of fair exchange protocol,but there were defects in traditional fair electronic contract signing protocols.Presents a new fair electronic contract signing protocol based on the off-line trusted third party.The protocol effectively prevents all kinds of security attacks,and improves the efficiency of the implementation.The security of the newly devised scheme is also examined and proved.It is showed that fair processes of exchange activities are guaranteed in this protocol.
Based on Zhang's short signature scheme without random oracles and k+1-square roots assumption, a new fair contract signing protocol with the off-line semi-Trusted Third Party is given because the disadvantages of existed fair contract signing protocol. The off-line semi-TTP intervenes into the protocol in cases where one party attempts to cheat or simply crashes to make the fair exchange optimistic. The off-line TTP need not be completely trusted, since the TTP can get neither exchanged signature when dispute is mediated. Because this protocol is based on short signature, which needs low storage and little communication, it can be used in low-bandwidth communication and low-storage environments.
The techniques of verifiable secret sharing and verifiable encryption are used in the construction of two party fair exchange protocols.The novelty of the construction lies in the introduction of the distributed semi-trusted third party.Compared to the previous fair exchange protocols with a single semi-trusted third party,the newly constructed fair exchange protocol can further guarantee the security and fairness of the transaction due to the existence of the distributed semi-trusted third party.
The difference between the fair exchange protocols and the non-repudiation protocols is proposed. Based on the publicly verifiable secret sharing scheme and group encryption scheme, a new multi-party fair exchagne protocol with an off-line semi-Trusted Third Party(off-STTP) is presented. The off-STTP who need not be completely trusted intervenes into the exchange in case of trouble. That the off-STTP can only decipher a sub-secret key makes sure the confidentiality of exchange data and the true fairness of the barter. The participants can barter with others at their will and the exchange topology is unknown to others including the off-STTP.