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Jisuanji gongcheng

Simple and Fast Optimistic Fair Exchange Protocol

Changshe Ma

Published Jan 1, 2007• 0 citations
OpenAlex

Abstract

Fair exchange protocol is the basis of secure electronic commerce where the RSA cryptosystem gains comprehensive applications.This paper presents a new efficient verifiable encrypted RSA signature scheme,on which a simple and practical optimistic fair exchange protocol is been devised.Analysis and comparisons show that this protocol is secure and fast.

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A new CEMBS based on RSA signatures and its application in constructing fair exchange protocol

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Fair exchange protocol is the basis of secure electronic commerce where the RSA cryptosystem gains comprehensive applications.This paper presents a new efficient verifiable encrypted RSA signature scheme,on which a simple and practical optimistic fair exchange protocol is been devised.Analysis and comparisons show that this protocol is secure and fast.
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.
A key problem of electronic commerce (for short e-commerce) is fair exchange which guarantees that at the end of the transaction, either both parties in the transaction receive each other's items or none do. A non-interactive optimistic fair exchange e-commerce protocol model based on the publicly verifiable secret sharing is presented. The main idea of our exchange protocol is to interchange verifiable and recoverable keys of the symmetric encryption for participants' items. So it is especially suitable for exchange of large-size items. Furthermore, our protocol is efficient and simple as it does not need interactive proof system which has been adopted by a large quantity of previously proposed fair exchange protocols. Based on a modified (2,2) secret sharing scheme, a concrete non-interactive fair exchange e-commerce protocol is designed.
Fairness is one of the basic requirements of e-commerce protocols and applications. CEMBS is proved to be an important cryptographic building primitive in constructing fair exchange protocols. In this paper the drawbacks of existing CEMBS-implementing methods are analyzed. A new CEMBS-constructing method based on RSA signature is proposed, which is proved to be simple, efficient and secure. Afterwards, a fair exchange protocol is built using the newly constructed CEMBS. And the devised scheme in this paper is the first efficient CEMBS based on RSA signatures.