Paper 2007/136

Fair Exchange Signature Schemes

Jingwei Liu, Rong Sun, Weidong Kou, and Xinmei Wang


In this paper we propose a new class of Fair Exchange Signature Scheme(FESS) that allows two players to exchange digital signatures in a fair way. Our signature scheme is a general idea and has various implementations on most of the existing signature schemes, thus it may also be considered as an interesting extension of concurrent signature presented in EUROCRYPT 2004 that is constructed from ring signatures. In our scheme, two unwakened signatures signed separately by two participants can be verified easily by the other player, but it would not go into effect until an extra piece of commitment keystone is released by one of the players. Once the keystone revealed, two signatures are both aroused and become effective. A key feature of the proposed scheme is that two players can exchange digital signatures simultaneously through a secret commitment keystone without involvement of any Trusted Third Party. Moreover, the efficiency of our signature scheme is higher than that of concurrent signature.

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Public-key cryptography
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Published elsewhere. has NOT been published elsewhere
FESSConcurrent SignatureSchnorr SignatureFair ExchangeElectronic Commerce
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jwliu @ mail xidian edu cn
2010-03-24: withdrawn
2007-04-18: received
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