Based on the analysis of a lot of network vulnerabilities and the characteristic of computer network, in this paper the model of network security status was built, and attack graphs were generated.

本文通过对大量的网络弱点的分析，结合网络的特性，建立了安全性分析模型，生成网络攻击图。

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The network security is especially important on account of the railage' s status.

由于铁路运输的特殊地位，网络安全就显得尤为重要。

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Based on the demand status of the information resource, analyses the network information security technique and the current status of authentication system.

就信息资源保护的需求现状，分析了当前网络信息安全通常采用的技术以及身份验证技术现状。

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