关键词: DS证据理论, 协商目标风险分析系统, 情景感知, 低轨道卫星通信, 网络安全, 风险评估

Abstract: In view of network security situation awareness framework’s lack of a precise mathematical quantitative method to network information security risk assessment, a network risk assessment model based on network security situation awareness framework is proposed by combining DS evidence theory and Consultative Objective Risk Analysis System(CORAS). Network security threats information fusion and situation perception based on DS evidence theory, hierarchical risk quantitative analysis based on probabilistic risk analysis, and risk discrimination. Low earth orbit satellite communication network is taken as an example to make a simulation and assessment. Experimental results show the proposed model and method can effectively identify threat situation, and increase the accuracy of risk assessment discriminant.

Key words: DS evidence theory, Consultative Objective Risk Analysis System(CORAS), situation awareness, low earth orbit satellite communication, network security, risk assessment