可转移离线电子现金

自1983年Chaum首次提出盲签名并将其用于设计不可跟踪离线电子现金以来，众多的电子现金系统相继提出，电子现金的研究已经取得了丰富的成果．电子现金的各种属性，如匿名性、不可重复花费性、可分性、公平性等，也被广泛地研究．但是，作为物理现金的一个自然属性的转移性却很少被密码学家们研究，公开文献中，涉及可转移电子现金的很少，还没有一个具体的安全的可转移电子现金方案．该文详细讨论了离线电子现金的转移性问题，描述了可转移离线电子现金的模型．第一次给出了一个具体的可转移离线电子现金方案，证明了此方案具备不可伪造性、不可跟踪性、不可重复花费性、不可陷害性等安全属性，并对可转移电子现金的效率问题进行了分析．

Transferable Off-Line Electronic Cash

Since Chaum first introduced blind signatures and presented the first untraceable electronic cash scheme, lar ge numbers of electronic cash schemes have been proposed. The varied properties of electronic cash, such as anonymity, no double spending, divisibility, fairnes s etc. were studied widely. But the literatures concerning the transferability a s one of nature properties of real cash were rarely seen. To our knowledge, no s ecure concrete scheme of transferable off-line electronic cash was presented in literatures. In this paper, the transferability of off-line electronic cash is discussed, and the model of transferable electronic cash is described. A concre te transferable electronic cash scheme is presented firstly. The security of the scheme on unforgeability, untraceability, no double spending, no farming is pro ved, and the efficiency is analyzed as well.