关键词: 前向安全特性, 强盲性, 电子现金, ElGamal

Abstract: Forward security characteristic and strong blind characteristic are introduced simultaneously into E-cash system.Forward security characteristic can decrease efficiently the loss caused by key exposure.Strong blind characteristic can protect message sender or consumer’s right of privacy in practical application.The introduction of the two characteristics can improve extremely the security of E-cash system.The security of the scheme is based on the difficulty to solve discrete logarithm problem.

Key words: forward security characteristic, strong blind characteristic, E-cash, ElGamal