关键词: RSA盲签名方案, 电子现金, 可信任的第三方（TTP）, 序列号

Abstract: With analyzing some unsafe factors of on-line electronic cash system such as the repeat attacks and reveal users’ information，this paper designs a RSA blind signature scheme，which creates a unique serial number by the Trusted Third Party TTP.Through discussion about safety and efficiency，this scheme has anti-repeat attacks，non-repudiation attack，anti-repeat draw and non-tracking，etc.even more security features.In addition，without adding timestamp and tracking electronic cash information，space efficiency has been improved only by storing the serial number.

Key words: RSA blind signature, electronic cash, Trusted Third Party（TTP）, serial number