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Journal of Guizhou University

A Certificateless Fair Exchange Protocol

Changgen Peng

Published Jan 1, 2011• 0 citations
OpenAlex

Abstract

Fair exchange protocol is an important security protocol in E-commerce.A certificateless verifiably encrypted signature scheme is constructed based on certificateless cryptosystem.And based on verifiably encrypted signature scheme,a new certificateless fair exchange protocol is designed.The proposed protocol reduces the cost of the key-escrow and certificate management,and meets the validity,fairness,timeliness and optimization.

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Fair exchange protocol is an important security protocol in E-commerce.A certificateless verifiably encrypted signature scheme is constructed based on certificateless cryptosystem.And based on verifiably encrypted signature scheme,a new certificateless fair exchange protocol is designed.The proposed protocol reduces the cost of the key-escrow and certificate management,and meets the validity,fairness,timeliness and optimization.
Fairness is the basic requirement of E-Commerce protocols. RSA is one of the most widely used cryptosystems. A fair-exchange protocol allows two parties to exchange items in a fair way so that either each party gets the other's item, or neither party does. In this paper construction and architecture of the existing fair exchange protocols are analyzed. Both practicality and efficiency problems of these protocols are also presented. Based on this analysis, an optimistic fair exchange protocol totally based on RSA signature scheme is proposed. The novel scheme employs verifiably encrypted RSA signatures in the extended integer ring that is elaborately constructed. The security and efficiency of the newly devised scheme are also proved and examined. It is showed that the proposed scheme is secure and efficient.
Perfect concurrent signature was introduced as an efficient approach to solving the problem of fair exchange of signatures. Almost all fair exchange e-commerce protocols that have been proposed until now either do not provide message privacy protection or adopt the sign-then-encrypt scheme to provide confidentiality. However, confidentiality is an important requirement of e-commerce protocols. This paper proposed a new concept called perfect concurrent signcryption which combined the concepts of perfect concurrent signature and signcryption together to resolve the confidentiality problem in e-commerce systems. It also proposed a certificateless perfect concurrent signcryption scheme and proved its security in the random oracle model. The scheme published the two ambiguous signcryptions in any order. Compared with the sign-then-encrypt scheme, this scheme enjoys shorter message length and less operation cost, which makes the scheme has wide application prospects.
Fair exchange of digital signatures is an important tool for signing digital contracts, e-payment and other electronic commerce actions. An ID-based scheme of fair exchange of digital signature is proposed in this paper. The protocol relies on a trusted third party, but is “optimistic”, in that the third party is only needed in cases where one player attempts to cheat or simply crashes. The proposed scheme has properties of short signature, low computation and verification cost. It can realize exchange of digital signatures fairly and efficiently. A key feature of our scheme is that it is identity-based, which needs no certificates and has a simple key management. To our best knowledge, this is the first identity-based scheme of fair exchange of digital signatures.