Survey of Sensor Attack Defense Strategies for Cyber Physical Systems

Cyber-physical system(CPS),as an intelligent system integrating computation,communication and control,plays an increasingly important role in various fields such as intelligent transportation and healthcare.Sensors play a crucial role in CPS but are also commonly targeted by attackers.Firstly,the scope of research on sensor attack defense is clarified,and the relevant stu-dies on sensor attacks are categorized into attack prevention,defense and recovery according to the timing of attack occurrence.Next,the types and impacts of sensor attacks are reviewed,including DoS attacks,replay attacks and deception attacks.Then,sensor attack detection methods based on multi-source consistency,historical consistency and response consistency are summarized.Subsequently,data fusion methods after attack detection are discussed,including Kalman filter-based and interval-based data fusion methods.Finally,potential future research directions are explored to further enhance the defense capabilities against sensor attacks in CPS.