The wide application of E-commerce has put forward the new demands on the modes of Web payment. E-cash payment system is a key mode of current all web electronic payment. In this paper, a novel secure and convenient E-cash payment scheme is proposed based on analyzing the present technology of E-cash. This scheme is composed of three protocols, which are withdrawal protocol, payment protocol and deposit protocol. Utilizing the property of the modulus operation, this scheme could meet the demand of E-cash with only few public keys, and solve the problem of payment change by using blind signature and direct signature. At last, a prototype system is realized. The experiment result shows that proposed E-cash system is feasible.
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