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Wuhan University Journal of Natural Sciences

An Identity-Based Scheme of Fair Exchange of Digital Signatures

Yu Yu, Yong, Yang Yang, Bo Bo, Guoqing

Published Jan 1, 2006• 0 citations
OpenAlex

Abstract

数字签名的公平交换是为签署数字合同，电子支付和另外的电子商务行动的一个重要工具。数字签名的公平交换的一个基于标志的计划在这篇论文被建议。协议依靠信任第三方，但是是“乐观”的因为第三方仅仅在一个播放器试图作弊或简单地垮掉的情况中被需要，。建议计划有短签名，低计算和确认费用的性质。它能相当并且高效地认识到数字签名的交换。我们的计划的特色是它是基于身份的，它不需要证书并且有一个简单关键管理。到我们的最好的知识，这是数字签名的公平交换的第一个基于身份的计划。

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数字签名的公平交换是为签署数字合同，电子支付和另外的电子商务行动的一个重要工具。数字签名的公平交换的一个基于标志的计划在这篇论文被建议。协议依靠信任第三方，但是是“乐观”的因为第三方仅仅在一个播放器试图作弊或简单地垮掉的情况中被需要，。建议计划有短签名，低计算和确认费用的性质。它能相当并且高效地认识到数字签名的交换。我们的计划的特色是它是基于身份的，它不需要证书并且有一个简单关键管理。到我们的最好的知识，这是数字签名的公平交换的第一个基于身份的计划。
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.
ABSTRACT A fair exchange protocol allows two entities to exchange digital signatures over open networks in a fair way, so that either each entity obtains the other's signature or neither entity does. Fair exchange protocol plays an important role in electronic commerce in the case of exchanging digital contracts. In this paper, we propose a fair exchange protocol based on identity‐based verifiably encrypted signatures. Our protocol involves an offline trusted third party which is only required when one entity attempts to cheat or crashes. The underlining identity‐based verifiably encrypted signature scheme is proven secure under the computational Diffie–Hellman assumption and is the first identity‐based verifiably encrypted signature scheme provably secure against existential unforgeable under adaptive chosen message and identity attacks in the standard model. Copyright © 2012 John Wiley & Sons, Ltd.
Based on the verifiably encrypted signature scheme without random oracles recently proposed by Gorantla et al.,a new scheme of optimistic fair exchange of digital signatures is proposed in this paper.The two players firstly exchange their verifiably encrypted signature on agreed-upon messages then their ordinary signature after the verification of each other's verifiably encrypted signature.If one of them executes the protocol dishonestly,the other can resort to a trusted third party so as to get the purpose of fair exchange of signatures.The proposed scheme has properties of short signature,low computation and verification cost.It can realize exchange of digital signatures fairly and efficiently.