Off-line E-cash System with Multiple Banks Based on Elliptic Curve
Jianzhong Zhang · Jisuanji gongcheng · 2007
Through the cryptanalysis of an E-cash system with multiple banks based on proxy signature proposed by Zhou etc.,it is found that the central bank or the third trustee can issue valid E-cash by imitating other legal banks.An off-line E-cash system with multiple banks based on elliptic curve is proposed using the technique of proxy-protected proxy signature.The E-cash’s denomination is marked with authorization in this E-cash system,and the analysis shows that it overcomes the disadvantages of those existing E-cash systems with multiple banks,and has higher efficiency.