Analysis And Improvement. Several E-cash Payment Solutions

In the 21st century, with development of modern science and technology, thetraditional business model can't constantly meet people's more and more demand.The development of e-commerce is the irreversible trend of economic development.The important link of e-commerce is e-payment, whereas electronic cash is an im-portant way of electronic payment, which is the hotspot in study of cryptographyin recent years.In this thesis, based on the analysis of the existing several electronic cashschemes, some improvements have been made. Besides, combined with the newpassword technology, several new electronic cash schemes characterized by practicaland different properties have been designed. The main results are as follows:1. Firstly, the analysis of the electronic cash scheme designed by Wang Ye hasbeen made and its advantages and disadvantages have been pointed out. In addition,some improvements have been made. Add the pre operations in the registered stageand cut trading time to improve effciency.2. Secondly, design an online indivisible electronic cash scheme and introducean identity authentication mechanism, which can not only effectively prevent thefraud conducts of the outlaws impersonating users, guarantee the authenticity ofboth parties'identities in the trade, but also can be applied to big volume businesstrade.3. Design a new offine indivisible electronic cash scheme in which signatureand blind signature are combined together. A strong safety electronic cash schemefeaturing the pre-safety characteristics of the signature scheme has been designed.4. Electronic cash solution proposed by Huang Zhengquan has been improved.The addition of the budget in the opening agreement enables tracking possiblemerely on the basis that the bank and the correspondent part with credibility co-operate. Therefore it has stronger anonymity, and minimizes the users'losses.5. The offine divisible e-cash scheme is improved. The characteristics of thisscheme is its application of the technical conceptions of secret sharing, From a newtechnological perspective, a highly effective electronic cash scheme is designed, whicheffectively prevent the users'payment in advance. 6. Design an online divisible e-cash scheme suited for micro-finance transaction.The characteristics are simple algorithm and convenient as well as strong application.