基于群签名的离线电子现金方案

A New Offline Electronic Cash Scheme Based on Group Signature

论文借助群签名的思想,实现了电子现金的匿名性和无关联性,有效地保护了用户的私有信息。电子现金的形式由两个签名组成:用户签名和银行签名。前者保证了电子现金的私有性和不可伪造性,后者保证了交易的有效实施。由于电子现金容易被复制,银行需保存电子现金的某些特征以避免电子现金的非法使用。该方案增强了电子现金方案的安全性,简化了盲签名体制下的电子现金实现过程。

In this paper,we propose a new efficient offline electronic cash scheme depend on the idea of group signature.This scheme can make the e-cash anonymously and unlinkabely,and realize the privacy of the e-cash.The e-cash is consisted of two parts ,one from user,the other from bank.The former protects the e-cash from forgeable ,and the later ensure the scheme can be applied effectively.Also,in our scheme,the bank must preserve the e-cash from being reused in some way.This method enhances the scheme security and reduces the process based on blind signatures.