A Survivability Quantitative Analysis Model for Network System Based on Attack Graph

Survivability is the ability of a system to continue operating despite the presence of abnormal events such as intrusions. Ensuring system survivability has increased in importance as critical infrastructures have become heavily dependent on computers. In this paper we present a survivability quantitative analysis model for network system based on attack graph, which indicates that survivability depends on network system itself, as well as the environment where it´s running. We identify the intrusion scenarios via attack graph analysis, and then suggest a quantitative measure of network system survivability. Mathematics formulas are given and network nodes that influenced survivability are investigated. From a case study, we identify the compromisable nodes that can be penetrated and damaged by intrusion and provide valuable suggestions to enhance system survivability design. The model is not only suitable for simple network systems but also applicable to distributed ones as long as the system is divided into atomic components.