Electronic Cash And Its Implementation

Electronic commerce is a trade transaction which can be implemented by electronic manners, and it has more and more close relation to our everyday life. Electronic cash is a very important payment system in electronic commerce, and the kernel technique to implement electronic cash is blind signature. Signature of knowledge is a special digital signature, man can prove that he knows a secret, but he doesn't leak any information about this secret. Signature of knowledge has been widely used in many group signature schemes, which can effectively decrease interactive times during signing. In this paper, we sum up signatures of knowledge of discrete logarithm, and extend it; at the same time, we construct an electronic cash payment system of distributed banks by utilizing group blind signature and signatures of knowledge of discrete logarithm, in which all banks form a group, every bank in this group can issue electronic cash, and the electronic cash is anonymous and can not be traced.