Abstract: In order to solve the security problem that the E-cash users get from bank have no blindness in the new E-cash system based on partial blind signature, this paper brings forward a new E-cash payment model which combines zero-knowledge identity proof based on improved ELGamal signature and partial blind signature. It can track user with the help of the third trusted party to avoid using E-cash illegally. Security analysis indicate that the model has strong security and practicability.

Key words: zero-knowledge identity proof, partial blind signature, E-cash

摘要： 为解决基于部分盲签名的新型电子现金安全系统中用户获得的电子现金不具备盲性的安全漏洞问题，将基于改进的ELGAMAL签名的零知识身份认证与部分盲签名相结合，提出一个新的电子现金支付模型，该模型在必要时可通过可信第三方跟踪用户，从而避免电子现金的非法使用。安全性分析证明该模型具有较强的实用性和安全性。

关键词: 零知识身份认证, 部分盲签名, 电子现金

CLC Number: 

• TP309.2