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在电子货币系统中，用户首先产生若干个密封的电子货币，银行打开其中的一些以检查它们是否有效．如果打开的都有效则为某个未打开的签字．文中用概率的方法提出了一种分割选择技术，银行打开用户密封的电子货币的数目由一概率决定，然后基于这种分割选择技术提出了一种新的电子货币系统，并分析了系统的安全性．
In the electronic money system, the user first generates several sealed electronic money, and the bank opens some of them to check if they are valid. If it is open, it is an unopened signature. In this paper, we propose a segmentation and selection technique by using the probability method. The number of electronic money that the bank opens the user’s seal is determined by a probability. Then, a new electronic money system is proposed based on this segmentation and selection technology, and the security of the system is analyzed Sex.