基于D-S证据理论的变电站通信系统信息安全评估

摘要

The quantification of each threat against information security of substation communication system is the prerequisite to the planning of security strategy. Based on the analysis of the requirements of substation communication system for information security,all threats are classified according to its four properties,based on which,the index system and hierarchy of information security evaluation is established. The joint weight is calculated by the scale method for each threat,experts' assessments are quantified and merged based on the D-S theory,and all threats are ranked according to the confidence interval. Case study shows that the quantified threats provide the theoretical support to the security strategy planning of substation.%量化各种安全威胁对变电站通信系统信息安全的影响程度是制定信息安全策略的前提.在分析变电 站通信系统信息安全需求的基础上,根据信息安全的4个性质将影响其安全的各种威胁进行分类.根据该分类建立变电站通信系统信息安全评估指标以及层次关系,利用标度法计算各个安全威胁的联合权重.进一步运用D-S证据理论将专家对各种安全威胁的评估进行量化和集成,最终依据信任区间将各个安全威胁进行大小排序.算例表明,该方法能直观地量化各种安全威胁的影响程度,能为变电站信息安全策略的制定提供可量化 的理论依据.