关键词: 入侵容忍, 暴露窗口, 半马尔可夫过程, 平均安全故障时间, 状态转移

Abstract: A quantitative analysis approach to the security of intrusion tolerant systems is proposed. The exposure window of intrusion tolerant systems is introduced into quantitative analysis, and the parameter can represent the deteriorating process of the systems. A Markov analysis process with the parameter is discussed, and the simulation results through this method greatly conform to the practical course of the security change. The new method provides a theoretical basis for establishing a safer intrusion tolerant system.

Key words: Intrusion Tolerant, Exposure Window, Semi-Markov Model, Mean Time To Security Failure, State Transition