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With the rapid development of Internet and e-commerce, information security is even more important, how to ensure data transmission in the network integrity, confidentiality, authenticity, and non-repudiation and e-commerce has become an information security research in the field of the main issues.PKI (Public Key Infrastructure) technology, E-commerce applications, network technologies such as key technologies, but also the core of information security technology. It is based on the use of modern cryptography, digital certificates, CA certificate center, network communication encryption protocols.Main task of this article is to PKI/CA system, a detailed study and description of proposed based on B/S model design framework, with emphasis on the CA system framework design, and roaming on the Research and Implementation of the certificate.Focuses on the PKI architecture, then focuses on the description of one of the key technologies (X.509 protocol), and finally focuses on the PKI system and international standards, as well as important applications.Mainly introduced from the software engineering point of view the overall structure of CA systems, and the CA system needs analysis the various components of design, enabling the user as logged,certificate management Certificate revocation and other functions of the modeling and design ideas.Introduces the CA system, RA (Registration Server), CA (digital certificate authentication center), the client operation (user registration server) the function of three subsystems design and implementation. This section is divided into three chapters. Chapter VI of the CA system, the first module of the WEB client framework for the overall description, and assist with implementation of the interface;
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