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中文摘要：
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。
英文摘要：
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.
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