引入系统状态转移概率的可生存性量化评估模型

Survivability Quantitative Evaluation Model of Introducing State Transition Probability

系统可生存性是网络安全研究的一个新方向,通过对系统可生存性进行评估,可不断完善系统体系结构,从而提高系统可生存能力.针对系统可生存性的量化问题,在深入研究现有的主要可生存性评估方法基础上,提出了系统可生存性的动态量化评估模型SQEM(Survivability Quantitative Evaluation Model),并对系统可生存性进行了形式化定义和数学解析.在SQEM模型中,引入了系统状态转移概率和动态设置指标权重的思想,使评估的准确性得到了提高.通过实例分析,证明了SQEM的可行性和有效性.

System survivability is a new study area on network security . The system architecture can be perfected, then survivability level be enhanced through survivability evaluating. This article puts forward a survivability quantitative evaluation model-SQEM, based on lucubrating the main method existed. Then it defines the measurement factors and parses the survivability mathematically, introduces state transition probability and the idea of setting the index power dynamically into the evaluating process of SQEM, which improved the accuracy of evaluation. An example is presented to illustrate the way SQEM works, which demonstrated the validity and feasibility of the method.