网络信息安全服务分析与研究

本文就网络信息安全问题进行分析和研究。从计算机网络的概念、发展阶段、分类和组成等方面对计算机网络加以概述，并从网络信息安全的定义、网络信息安全问题的产生与网络信息安全的威胁对网络信息安全进行分析。为达到网络系统的信息安全，从机密性服务、完整性服务、可用性服务、数字签名、公钥基础设施和访问控制展开分析研究。

This paper focuses on the analysis and sudy of the network information security. The scope range from the computer network concept, development stage, in terms of classification and composition to be an overview of computer networks, and from the definition of net- work information security, network security issues of information generation and network information security, information security threats to network analysis. To achieve the network information security, we analyze and research the issues of the secret services, integrity, service, a- vailability of services, digital signatures, public key infrastructure and access control.