为了评估分布式网络的安全状态,有效拦截攻击,避免传统方法可靠性和实用性低的弊端,提出一种新的分布式光纤网络中层级化安全威胁指数分析方法.通过层次分析法对不同威胁源对分布式光纤网络安全性的影响情况进行分析,建立安全威胁评估层级化模型.给出分析时间窗口内服务的威胁指数,对各种严重等级攻击的威胁指数等效性进行分析,以增强评价指标中较小者的显著性,防止威胁指数计算结果出现误差.介绍了不同时刻主机和网络系统的威胁指数.经实验发现,主机对网络威胁的影响程度大,网络在晚上遭遇攻击的概率大,网络管理员需更加防范.通过分析的安全威胁指数对网络安全状态进行评估,发现其可靠性和实用性强.%In order to evaluate the security status of the distributed network, effectively intercept attacks, to avoid the traditional method of reliability and practical drawbacks of low,an analysis method of index level of dis-tributed optical fiber network of new security threats was put forward. The influence of different threat sources on the security of the distributed optical fiber network is analyzed by means of analytic hierarchy process(AHP),and a hierarchical model of security threat evaluation is established. Give the analysis time window service threat index, analysis of all kinds of serious threat index equivalent level attack,in order to enhance significantly smaller evalua-tion index in the index calculation results to prevent the threat of errors. The threat index of host and network sys-tem at different time is introduced. The experiment found that the host has a great impact on the network threat, and the probability of attack in the evening is great. Network administrators need to be more defensive. Through an-alyzing the security threat index to evaluate the network security status,it is found that the reliability and practica-bility of the network security status is strong.
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