With analyzing electronic cash and electronic wallet,this paper proposes an anonymity-revocable and recov-erable off-line e-cash system based on trusted third party (TTP).

• 在分析电子现金和电子钱包的基础上,引入可信第三方(简称TTP),提出一种同时具有可撤销匿名性和可恢复性的离线电子现金系统。