基于可信第三方的可撤销匿名性的公平可分电子现金系统

Trustee- based Anonymity- revocable Fair Divisible E- cash System

第一次提出了一个实用的基于可信第三方的可分离线电子现金系统,该系统具有匿名性,以保护消费者的隐私;其匿名性是可撤销的,在必要的时候可以打击犯罪,以得到政府的使用许可;支付过程是公平的,防止某一交易方在交易中蒙受损失;电子现金是可分的,可以像现实货币一样按需要精确分割,用于精确支付。借鉴转换数字签名的思想,引入可信任的第三方,实现了交易过程的公平性和在必要时撤销匿名性,但只有在注册阶段、产生争议及撤销匿名性的时候才会涉及可信任的第三方。这种电子现金当然还可杜绝重复花费、防止超额支付及防伪。在支付协议中,该系统比目前基于二叉树的最快的可分电子现金计算量少60倍。

For the first time,this paper proposes a practical divisible off- line e- cash schema based on trustee.The anonymity,which the customer's privacy depend on,can be revoked whenever needed so as to punish crime and gain authorization of go- vernment.Fairness in the trade process prevents traders on both sides from loss.The divisible e- cash,which can be precisely divided like real cash,are paid in precision.By quoting the concept of digital signature transformation,introducing trustee,fairness in trade process and revocation of anonymity are realized.Trustee is only involved in during registration,disputation,revocation of anonymity. In addition,this kind of e- cash acts as a means to curb repetitive- spending,overdrawing,counterfeiting.Computation overhead of our system are 60 times less than the rapidest one at present based on binary- tree divisible e- cash system.