Research On Security Of Cyber-physical Fusion System Under Targeted Attack Strategy

The arrival of Industry 4.0 provides many opportunities for the modern development of informatization and intelligence,and its core architecture is Cyber-Physical Systems(CPS).The CPS system provides intelligent perception,dynamic control,and information services for industrial control systems through computing,communication,and control coordination.At the same time,it is increasingly applied in fields related to the national economy and people’s livelihood,such as power systems,transportation systems,and critical infrastructures such as smart cities.In the CPS system architecture,data services between physical and computing resources networks are increasingly interdependent.This coupling relationship often enables faults in one sub-network to propagate rapidly and affect the regular operation of another network,resulting in the great harm of cascading failures.Therefore,how to scientifically explore the security issues in the cyber-physical fusion system is an important issue worthy of in-depth study.The existing research content mainly focuses on a single network or a simple topology network,but there are few studies on the unequal ratio coupled network and the mixed network with different connection ratios.To this end,this paper understands the causes and key influencing factors of cascading failures by describing and modeling the relationships between and within different networks.It mainly includes the following three aspects:(1)This paper proposes a percolation-based fault model with a one-to-many node ratio.After deliberately attacking the node degree,the critical value that the system can maintain function after being attacked is deduced.This paper uses programming to simulate the modeling process of the system,and based on the characteristics of the deliberate attack behavior,simulates the failure transmission process of the CPS system after being attacked,and analyzes the relationship between the node size and the proportion of failed nodes when the CPS system finally reaches a steady state.This will help to validate the theoretical analysis of system failure;(2)Based on the above research,this paper also studies the mechanism of the mixed-proportion node coupling relationship on the cascading failure of the CPS system to further analyze the security of the system after being attacked.Compared with the first research work,we changed the one-to-many connection ratio of nodes,mixed the two ratios,and compared and analyzed the security of the CPS system under this model.At the same time,the cascading failure process of the entire CPS system is simulated by experiments,and the results of the experimental data are compared and verified with the theoretical values.In this case,change the network parameters or attack ratio,and analyze the critical risk threshold when the system is completely broken;(3)To demonstrate and understand the robustness of cyber-physical systems,this paper designs an interdependent CPS system model with load characteristics to analyze the different fault cascading characteristics inherent in each component network.The communication network and the physical network are affected by different cascading rules.For the physical network with flow-carrying,we redesign the load capacity distribution model to combine with the percolation model of the communication network to capture different cascading fault characteristics.To sum up,this paper provides theoretical support and application support for the security research of cyber-physical fusion systems by studying non-proportional networks and network cascading failure processes with load characteristics.