A Safety-Security Integrated Analysis Approach

A large number of computer, communication and control technologies are applied in train operation control system, which brings the internal and external security risks to the urban rail traffic, especially under the background that security incidents of industrial control system occur frequently, security of operation control system of urban rail train need high attention, but the traditional safety analysis methods do not consider malicious and subjective security risk. This paper analyzes the relationship between the safety and security and necessity of comprehensive analysis of safety and security is defined. A comprehensive analysis method of security and safety based on extended fault tree is proposed. The extended fault tree model integrates the fault tree with displaying safety failure logic, and the attack tree with describing the security attack behaviors, and the analysis model based on the extended fault tree is established. The extended fault tree model is able to analyze the effect of security risk for safety and operational efficiency of train control system in this paper, which has important guiding significance for analysis work of operation risk of train control system. In addition, the fault tree and attack tree can be quickly established with small adjustments, which make it a simple and intuitive method.