Abstract: This paper proposes a secure, scalable anonymity scheme for off-line electronic payment. With this new method, each consumer can attain his required anonymity level, depending upon the available time, computation and cost. Some smaller e-cash can be afforded by the scalable anonymity agent to pay the shop. The problem of separability in e-cash can be solved in another way. In compariso n to other schemes, the new method can help the consumer recover the lost money even if the computer has crashed and all the files are removed accidentally, or his e-cash wallet has been lost, it can prevent from eavesdropping, tampering an d perfect crime effectively as well.

摘要： 提出一种新的具有可提升用户匿名性的离线电子支付方案。用户都可以根据交易 时间、计算及通信开销，选择提高其匿名性，还可以从SA代理那里获取面额较小的电子现金 用于支付，解决了电子现金的“找零” 问题。与其他支付协议相比，该协议还可以恢复因 计算机崩溃或文件误删而丢失的电子现金，而且能够防止重复花费、窃听、篡改和高手段的 犯罪。

关键词: 匿名性, 升级, 电子支付, 重复花费

CLC Number: 

• TP399