一个新的安全且高效的电子现金系统  

New electronic cash system with higher security and efficiency

作　　者：费雄伟[1] 李乔良[1] 

机构地区：[1]湖南大学计算机与通信学院,长沙410082

出　　处：《计算机应用研究》2008年第5期1543-1545,共3页Application Research of Computers

基　　金：国家自然科学基金资助项目(10571052;60373062);湖南省教育厅优秀青年基金资助项目(04B047)

摘　　要：H.Xiaosong和T.Chik How在ITCC’05上提出了一个新的基于ACJT群签名的电子现金模型,效率和安全性很高,但却不能用来解决敲诈和其他的匿名性相关问题,如洗黑钱,不能事前处理二次支付,不能降低存储需求,不能实现可分性。为此通过以下方法来改进他们的电子现金系统:利用别名证书来防止敲诈;利用商家与用户的验证来事前避免用户的二次支付;加入有效期以减少存储空间;提供电子现金的类似可分性,同时也给出了安全性和效率的分析。H. Xiaosong and T, Chik How presented a new ACJT-based electronic cash model with high efficiency and security in ITCC＇ 05, but it could＇t prevent blackmailing and solve other anonymous problems such as lauder, It also can＇ t avoid dual payment in advance and could＇ t decrease storage space. Furthermore it didn＇t realize divisibility of ecash. So,this paper enhanced it through some methods as follows：apply alias-certificate to prevent blackmailing ; use verify between merchant and user to previously avoid user＇ dual expense;add expire date in eeash in order to reduce the demand of storage ;provide quasi-divisibility for ecash. Meanwhile ,this paper analyzed this novel electronic cash system＇ s efficiency and security.

关 键 词：群签名 电子现金系统 敲诈 别名证书 二次支付 类似可分性 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]