Electronic Payment And Network Security Research And Realization

As the core factor and crucial process, electronic payment has long time been a primary bottleneck hindering the rapid growth of e-commerce. How to realize the secure payment in the insecure network environment, has become not only the focus which people keep close watch on, but also an important subject to be devoted deep and thorough research.This paper gives the subsystem's payment processing description, through the mapping of the payment methods in reality to electronic payment methods in network. Aiming at the electronic payment's security and its security attacks, combining with many network security techniques, this paper gives a secure electronic payment system based on SET protocol for the electronic credit card. This system can assure the security of the transaction ultimately, it is art efficient solution of electronic trade.Modern cryptography is the basis of the network security ,and the public key algorithm is also the basis of the modern cryptography .This thesis gives a deep research on the three algorithms based on IFP, DLP and ECDLP ,gives a example for explanation .Aiming at the focus of electronic payment field, namely electronic cash, this thesis carry through deeply research.Brands' restrictive blind signature scheme is the theory basis of off line electronic cash protocol ,which can assure the anonymity of honest users and detect the double spending activities afterwards .The thesis improves the Brands' restrictive blind signature scheme ,through simplifying the blind expression ,and simulates it to ellipse curve .On the premise of ensuring security ,it declines the computing complexity ,enhances the efficiencyBased on the improvement of Brands' restrictive blind signature scheme, the thesis not only proposes a secure off line electronic cash based on ECDLP, but also gives a comprehensive analysis of its three sub protocols of withdrawal, payment, and deposit. Its security is particularly demonstrated from eight aspects, the efficiency of this scheme is beneficial discussed. Subsequently, this thesis gives module analyzing of the electronic cash system, the interface introduction and a part of source code, which sets up a solid foundation for the practical utility of electronic cash.In the end, this paper proposes the further work to perfect the secure off lineelectronic cash based on ECDLP, and prospects the future of development of the electronic cash.