| VULNERABILITY ANALUSIS AND RISK ASSESSMENT |
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Attack detection and security state estimation of cyber-physical systems |
| GAO Yang1, REN Wang1,3, WU Renpu1, WANG Weiping2, YI Shengwei1, HAN Baijing2 |
1. China Information Technology Security Evaluation Center, Beijing 100085, China;
2. School of Computer and Communication Engineering, University of Science and Technology Beijing, Beijing 100083, China;
3. College of Electronics and Information Engineering, Sichuan University, Chengdu 610065, China |
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Abstract In the Industry 4.0 context, cyber-physical systems (CPS) need effective security and control capabilities. This study analyzes attack detection and security state estimation based on a cyber-physical system model attacked by an actuator. The attack detection uses a finite time attack detector that ensures that existing attacks can be accurately detected within a preset time limit. An observer is then designed to estimate the system state. A theoretical analysis shows that the observer ensures that the system can immediately adjust when attacked and that the system will reach a safe, stable state. Simulations verify the effectiveness of this method.
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| Keywords
cyber-physical systems
abnormal state detection
safe state estimation
detector
observer
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Issue Date: 19 October 2021
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2021,
Vol. 61
