Divisible e-cash system with multi-banks based on proxy signation

Objective—To achieve secure and fair e-cash payment that a shop and its users may use different banks.Methods—by introducing proxy signature,a new fair and divisible e-cash system with multiple banks without TTP based on WI-Schnorr partial blind signature is proposed in this paper.Results—On one hand,the central bank can easily cancel the signing power of issuing banks and resist collusion attack;on the other hand,anonymity of the banks and withdrawer can be protected in our system,the trace of e-cash and withdrawer can be realized.Conclusion—By security analysis,it shows the new scheme is an efficient e-cash system with multi-banks.