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Multi-party fair exchange protocol with an Off-line Semi-Trust Third Party

Yang Zhao, Zhiguang Qin, Tian Lan, Hu Xiong, Fengli Zhang

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Abstract

A multi-party fair exchange protocol is a cryptographic protocol allowing several parties to exchange electronic items in such a way that everyone gives an item away if and only if it receives an item in return. In this paper, we present a new multi-party fair exchange protocol with an Off-line Semi-Trust Third Party (OSTTP). The new protocol can ensure strong fairness and the OSTTP can't get the exchanged secrets without conspiring with any participants.

About this research paper

What this paper is about

A multi-party fair exchange protocol is a cryptographic protocol allowing several parties to exchange electronic items in such a way that everyone gives an item away if and only if it receives an item in return. In this paper, we present a new multi-party fair exchange protocol with an Off-line Semi-Trust Third Party (OSTTP). The new protocol can ensure strong fairness and the OSTTP can't get the exchanged secrets without conspiring with any participants.

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Key contribution

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Method / approach

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Available abstract

A multi-party fair exchange protocol is a cryptographic protocol allowing several parties to exchange electronic items in such a way that everyone gives an item away if and only if it receives an item in return. In this paper, we present a new multi-party fair exchange protocol with an Off-line Semi-Trust Third Party (OSTTP). The new protocol can ensure strong fairness and the OSTTP can't get the exchanged secrets without conspiring with any participants.

Key concepts: Protocol (science), Trusted third party, Computer science, Computer security, Third party, Cryptographic protocol, Key exchange, Cryptography

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