This article first analyzes the security of computer network, introduces basic technology that guarantee the security and emphasizes that cryptography is the core technology.

本文第一章分析计算机网络的安全性，介绍保障计算机网络安全的基本技术，指出密码技术是网络安全技术的核心。

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With the wide application of computer and network technology on libraries, the security problem of the library information network becomes unavoidably more and more important.

随着计算机及网络技术广泛应用于图书馆，使得图书馆信息网络安全问题成了不容回避的重要课题。

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With the rapid development of computer network technology, people pay more and more attention to network security.

随着计算机网络技术的迅猛发展，网络安全越来越受到人们的重视。

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