By the development of computer science and network technology, the circumstances on the security of information and network are increasingly rigorous.
随着计算机信息技术与网络技术的迅猛发展，信息与网络的安全形势也日趋严峻和复杂化。
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。
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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