| This thesis begins with the definition,function and features of ElectrnicCommerce and introduce its actuality and foreground. We put forward an important question-the security question of EC on the basis of this. We briefly expound the security factor and means to attack EC, then introduce the main security mechanism and analyze the merits and shortcomings of every kind. From things mentioned above, we lead to the popular and effective mechanism-PKI security mechanism.Many country in the world have been studying PKI security mechanism for many years and have formed a integrate set of scheme based on the asymmetrical cryptography and digital signature technology. In this paper we will expound the theory basis, basic orgnization,function,. main trust model,application, actuality and foreground of PKI security mechanism.Digital signature and digital certificate are the hard core of the whole PKI and the electronic certificate system which manages digital signature is the hard core of PKI. In this paper we present hoe to design and implement a electronic certificate system. In the design part, we introduce the attribute,function, structureand classification. In the implementation part, we will expound how to inplement every part of this system, including the technology, interface, flow chart and the source code of he key part.At last we summarize the design and implementation of this system and address the application foreground of this system and the work direction of the future. |
