【Key words】 network security； network security risk evaluation； multi-goal attack graphs； risk computation； attack graph Automated generation；
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网络安全风险评估系统 NSRAS
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实践结果证明，应用该算法和模型实施的风险评估对被评估单位的网络安全防护和管理工作起到了良好的指导作用。
The model is applied in security evaluation work and the practice result proves that the model and algorithm do a good directive function in network security protection and management.
现今的评估方法多数仅对网络安全事件进行定性的评估，不能给出网络安全风险值的定量说明，评估结果缺乏客观性、动态性和可信性。
Most risk assessment methods only give a qualitative account of the network threat events without the quantitative value, and the evaluation results lack objectivity, dynamics and credibility.
提出了一个基于威胁评估和模拟攻击的安全风险评估模型，设计并实现了网络安全评估原型系统。
A risk assessment model based on threat assessment and simulation attack is proposed, and a kind of prototype system is designed and realized.
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