The Research On Security Techniques Of E-Payment And E-Cash

With the rapidly development of information technology today, more and more attention has been paid to e-commerce, electronic payment in particular. In short, electronic payment is payment by means of information techniques. The most common ways of e-payment are: electronic transformation, e-cash and e-cheque. In this paper, we emphasize on the research of e-cash and e-cheque.As for the construction of e-cash scheme, different kinds of schemes don't have a uniform way. Generally, people will try variety of ways to give a secure e-cash based on different kinds of trapdoor one-way functions. Out of this consideration, we give a way to construct a secure e-cash system based on VSS and prove its security. We also give a specified example of how to construct a secure e-cash scheme based on the VSS scheme of Pederson91'.In the process of the research of e-cash general modal, we find restricted blind signature is a main block of e-cash. And many other applications require controllable anonymity, which can be applied by restricted blind signature. So, we also make a research on restricted blind signature and give out a new restricted blind signature scheme based on Bilinear Pairings.The most natural ways to implement an e-cash system is by means of Smart Card. But Start Card has such disadvantages as low computer power and limited storage. Out...