【摘要】 本文简述了电子现金系统的研究成果及其发展现状 ,并对文Brands提出的基于限制性盲签名的电子现金系统作了改进 ,提出了一个新的电子现金系统 ,在用户提取的由银行盲签名的电子现金中 ,嵌入有由银行规定的该电子现金的有效期 ,银行只需保留所有已经使用过的、还未过期的电子现金 ,这就大大地减少了银行的存储量 .更多还原

【Abstract】 In this paper,we reviewed the art of e-cash in brief,and improved the Brands’ e-cash system based on the restrictive blind signature.In our new e-cash system,the withdrawal date and expiry date,prescribed by the bank are embedded in the withdrawn e-cash.Users cannot alter these information later,the bank only needs to keep all used and undue e-cash in his database to trace the double-spender.Thus it reduces the storage level and improves the querying efficiency of the bank to detect double-spending.更多还原