关键词: 信息物理系统, 信息安全, 攻击检测, 贝叶斯假设检验, 先验概率分布

Abstract: Cyber-physical systems (CPS) are physical processing systems in which the concepts of communication network are introduced. In such systems, physical processes are monitored and controlled by computer-based technology. And these provide solutions for many applications in national defense and industrial production. However, this also makes the original industrial system environment face more security risks. In this paper, we consider the security of CPS control layer. Based on the Bayesian hypothesis test principle, this paper presents a detection method for tamper attacks to measurement data in the control layer. This method makes use of the prior knowledge of parameters so that the model's judgment is still available under small sample size. At the same time, the conclusion computes the probability of attack behaviors exactly, which can explain the possibility of the current state more intuitively. Compared with the traditional hypothesis test method, this method conforms to the background of CPS attacks, so it is practically advantageous.

Key words: cyber-physical systems (CPS), information security, detection method, Bayesian hypothesis test, prior distribution