基于签密的公平交易协议

Signcryption-based fair exchange protocol

通过把签密技术引入到并发签名中,提出了一个基于签密的并发签名方案,在随机预言模型下,可证明该方案在适应性选择消息攻击下能抗存在性伪造。基于该方案,提出了一个可用于交易电子商品的公平交易协议。该协议不需要安全通信信道,协议的交易双方产生对称的模糊签名,且将关键数释放的权利均匀分配给各参与方,很好地保证了交易的机密性、模糊性与公平性,使得该协议在电子支付、合同签署、邮件认证等电子商务活动中有着比较广泛的应用前景。

By introducing signcryption technology into concurrent signature,a signcryption-based concurrent signature scheme was presented,which was proven to have the existential unforgeability against adaptive chosen messages attacks under the random oracle model,Based on this scheme,a fair exchange protocol was proposed,which could be used to exchange digital goods.This protocol did not need secure communications channel,in which two parties generate sym-metrical ambiguous signatures and individual keystones were released by themselves,which ensured the properties of confidentiality,ambiguousness and fairness,which made our protocol could be used in e-commerce payment,e-contract signing,mail authentication,etc.