基于椭圆曲线的离线公平可分电子现金系统

Fair Divisible Off-line E-cash System Based on Elliptic Curves

基于椭圆曲线离散对数问题和Brands的受限盲签名技术,提出了一个基于椭圆曲线的离线公平可分电子现金系统。系统具有匿名性,能有效保护消费者的隐私,在必要时可撤销匿名性以打击犯罪,交易过程的公平性通过引入可信第三方实现,防止交易中的某一方受到欺诈,但可信任的第三方只在注册阶段和出现争议时才在线。引入可兑币实现电子现金的可分性,可用于多次精确支付。该电子现金还具有防止超额支付,重复花费的特点。分析表明,方案是安全的、高效的。

In this paper, we proposed a fair divisible off-line electronic cash system based on elliptic curve discrete logarithm prob- lem （ECDLP） and restrictive blind signature technique. The anonymity which the customer＂ s privacy depend on, can be revoked whenever needed so as to punish crime. By introducing trustee, fairness in the trade process prevents traders of both sides from loss. Trustee is only involved in during registration, disputation and revocation of anonymity. The divisibility can be achieved by using transferable cash, so the e-cash can be paid in precision. Analysis testifies its security and efficiency.