中文摘要：

对Au等人的支持暂停匿名用户服务的电子现金系统作出性能和安全性的改进。改进系统是通过结合自盲化证书和批量零知识证明技术对Brickell等人的EPID(enhancedprivacyID)方案作出扩展而得到的，而且构造过程借鉴了Xi等人将系统的运行时间划分为若干时间周期且为未被废除用户颁发通行证的思想。改进系统要求用户在取款之前通过预计算阶段取得通行证，之后各参与方在取款和支付协议中的运算和通信耗费均为常数。此外，改进系统在基于游戏的模型下满足更高等级的平衡性和可开脱性。

英文摘要：

This paper im proved A u et a l 5 * se-cash system w ith anonymous user suspension. To achieve im provem ent in pe rformance and se c u rity , th is paper extended the E P ID system o f Brickell et al. by in co rporating the technique of self-blindable credentia l and batch zero-knowledge proof. M oreover, the construction o f the new system adopted the approach o f X i et a l. , i.e. , to d iv id e system tim e in to sm all periods and to issue passports to users who have not been revoked. In the revised system ,users should obtain passports through the pre-com putation stage before w ith drawinge-coins. After that, the com putation andcom m unication cost of all the parties in the w ith drawal and paym ent protocols are constant. In addition , the new system achieveshigh er level o f balance and exculpability in game-based model.