关键词: SAP2DR, 网络安全, 区域轨道交通智能服务系统, 风险评估, 云计算环境

Abstract: Network security is the environmental prerequisite for the safe, reliable and stable operation of the intelligent service system for regional rail transit. On the basis of theoretical research on existing network security models, this paper achieves organic integration of dynamic information security theory and proposes an SAP2DR2 security model based on situational awareness. Additionally, on the basis of the characteristics of the intelligent service system for regional rail transit in the cloud computing environment, it proposes a security strategy of "one center, five levels". In combination with this security strategy, the analytic hierarchy process and SAP2DR2 model are used to conduct risk assessments on network security for the above system, providing data basis for further research on automatic generation and adaptive adjustment of weights.

Key words: SAP2DR, network security, intelligent service system for regional rail transit, risk assessment, cloud computing environment