Network security attracts more and more attention. This paperintroduces implementation of network security. It also describes various measures for security from the viewpoint of network platform, data transmission, user access and so on.%网络安全问题日益引起人们的关注。本文从应用的角度，介绍了网络安全的实现方式，以及从网络平台、数据传输、用户访问等方面采取的安全措施。
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