基于代理部分盲签名的离线电子现金方案

An Off-line Electronic Cash Scheme Based on Proxy Partially-blind Signature Scheme

代理盲签名结合了代理签名和盲签名的优点,在电子现金中广泛应用。但在大多数基于代理盲签名的电子现金系统中,电子现金的金额是不可见,而且恶意用户能伪造跟踪信息,因此不满足实用性和不可重复花费性。本文提出一个基于双线性对代理部分盲签名方案,其安全性可规约为Computational Diffie-Hellman(CDH)问题。在代理部分盲签名和知识签名的基础上,提出一个安全的电子现金方案,防止恶意用户伪造跟踪信息,实现电子现金重复花费检测。分析结果表明,该方案满足不可重复花费性、不可伪造性、匿名性和实用性。

By combining the advantages of a blind signature with a proxy signature,a proxy blind signature can be widely applied in the electronic cash. However,in most of electronic cash system based proxy blind signature,electronic cash amount was invisible. And a malicious user forged the tracking information. So these schemes didn＇t meet practicability and no double spending.The paper proposes a proxy partially-blind signature based bilinear parings. The signature is unforgeable under the Computational Diffie-Hellman assumption. On the basis of the new proxy partially-blind signature and signature of knowledge,this manuscript proposes an electronic cash scheme. The scheme can prevent a malicious forgery of tracking information and achieved doublespending detection. Analysis shows that the proposed scheme can satisfy no double spending,unforgeability,anonymity and practicality.