无可信第三方的可分电子现金方案

针对引入可信第三方的可分电子现金方案中系统负担增加及第三方的追踪不确定的问题，提出了一种无可信第三方的可控匿名性的可分电子现金方案。方案中银行根据司法机构提供的线索或凭证，要求同一时间戳的用户打开消息，实现对电子现金和取款人的追踪。这样的追踪用户是可以察觉的，而且电子现金使用明文形式表示，易于分割。通过对方案的安全性分析和与最近的一些电子现金方案的性能比较，本方案是安全有效的。

Divisible E-cash Scheme without Trusted Third Party

Aiming at the problems that the divisible E-cash schemes with trusted third party cause additional costs and the level of anonymity is uncertain, an anonymity-revocable and divisible E-cash scheme is proposed without TTP. In this scheme, according to the clue and certificate provided by the judicial organization, the bank requires the user to open the message with the same time stamp, which can realize the trace to E-cash and withdrawer. And the user is aware of this trace. Moreover, E-cash is expressed in plain text so that it is easy to be divided. Through security analysis and performance comparison with some recent schemes, this scheme is safe and effective.