基于代理签名的多银行公平可分电子现金系统

Divisible e-cash system with multi-banks based on proxy signation

目的为了实现商家和用户各自使用不同银行的安全公平可分的电子支付。方法基于WI-Schnorr部分盲签名方案,通过引入代理签名,设计了一个无TTP的多银行公平可分电子现金系统。结果一方面,系统可以方便地撤销发币银行的发币权利,解决发币银行合伙攻击的问题;另一方面,系统保证了发币银行和合法用户的匿名性,实现对电子现金和用户的追踪。结论通过分析,证明该方案是一个安全的多银行可分电子现金系统。

Objective-To achieve secure and fair e-cash payment that a shop and its users may use different banks. Methods-by introducing proxy signature, a new fair and divisible e-cash system with multiple banks without TTP based on WI-Schnorr partial blind signature is proposed in this paper. Re-sults-On one hand, the central bank can easily cancel the signing power of issuing banks and resist collusion attack; on the other hand, anonymity of the banks and withdrawer can be protected in our system,the trace of e-cash and withdrawer can be realized. Conclusion-By security analysis, it shows the new scheme is an efficient e-cash system with multi-banks.