一个基于环签名的英式电子拍卖协议

提出了一个基于双线性对的环签名方案,该方案具有如下特点:(1)签名者的身份可通过管理员追踪;(2)管理员的身份追踪权能被分享;(3)当签名中用于追踪签名人部分的内容为空时,它依然是一个具有无条件匿名性的环签名方案;(4)保留了环签名较群签名灵活和有效的优点。最后利用该方案对Omote和Miyaji的英式电子拍卖协议进行改进,克服了原协议中参加同一次拍卖的投标者的多次投标能被跟踪的缺点。

English Auction Protocol Based on Ring Signatures

In this paper,we propose a ring signature scheme based on bilinear maps.It has the following advantages:(1)The manager can identify the signer from her/his signature.(2)The traceability of the manager can be shared with others.(3)When the strings using to find the signer in the signature is null,the scheme is an ordinary ring signature scheme with unconditional anonymity.(4)The scheme keeps the properties such as no setup procedures and no coordination comparing with the group signature scheme.Then we improve the Omote and Miyaji's English auction protocol by utilizing our ring signature scheme.The new English auction protocol has not the drawback:in an auction anybody can link which bids are placed by the same bidder.