论文从安全问题的现状、分类和对策入手，提出VPN技术及用VPN技术实现安全通信。

Beginning with the current situation, classification and countermeasure of the information security, then we bring forward the VPN technology.

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论述和分析了加密技术及其在电子商务安全方面的应用现状。

The paper discusses and analyses Cryptography technology and its application in e-commerce security.

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本文对PKI安全机制的理论基础、基本组成和功能、P KI技术的应用以及PKI的现状和发展前景加以论述。

In this paper we will expound the theory basis, function, application, actuality and foreground of PKI security mechanism.

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