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介绍了网络安全的概念及特征，并着重讨论了包过滤型防火墙和代理服务器等两种类型的防火墙和数据加密技术在网络安全中的现状及可能的发展趋势。
This paper introduces the concept and characteristics of network security, and emphatically discusses the current status and possible development trend of network security in the two types of firewalls and proxy servers, such as packet filtering firewall and proxy server.