Cascade Failure Modeling And Mitigation For Scale-Free Network Under Selective Forwarding Attack

In recent years,with the development of social economy and network information science and technology,the problems of network security and stability also come into being.In reality,the degree distribution of many networks,such as social networks,Internet and transportation networks,obey power law distribution,which can be abstracted into scalefree networks to reveal their internal relations.The network with the scale-free characteristic is vulnerable to deliberate attack,which may lead to cascading failure and large-scale network breakdown.Besides,the selective forwarding attack of malicious nodes within scale-free networks will destroy the transmission of network data and reduce the availability of network information sharply.Therefore,this paper is devoted to the modeling and mitigation methods of scale-free network cascading failures under selective forwarding attacks.The research content is as follows.Firstly,in order to solve the selective forwarding attack of scale-free network cascade failure modeling problem,a selective forwarding attack model based on the importance of nodes is established.Based on this,a load redistribution strategy of failed nodes considering selective forwarding attack behavior is proposed,and a cascade failure model of scale-free network considering selective forwarding attack behavior is obtained.Based on the cascade failure model,propagation conditions that do not trigger network cascade failure are obtained through theoretical derivation.Simulation results show that selective forwarding attack is beneficial to improve network connectivity,but will destroy the integrity of network information,and the integrity of network information is negatively correlated with the intensity of selective forwarding attack.Secondly,in view of the cascade failure model based on network structure cannot reflect the cascade failure behavior under the change of network data transmission direction,and is not suitable for the study of the network cascade failure mitigation method under the route-oriented selective forwarding attack.A dynamic network cascading failure model containing packet generation,transmission and death process is established,and a routing strategy with tunable parameters based on trust model is proposed.On this basis,the effects of network parameters and routing parameters on network against cascading failures are analyzed.Simulation results show that the scale-free network has the strongest robustness against cascading failures due to the existence of the optimal global information update time step and the optimal routing parameters.Finally,a distributed adaptive routing method of scale-free network for selective forwarding attacks is put forward to enhance the network’s ability to resist selective forwarding attacks and the robustness of network against cascade failures.Based on the principle of polynomial,data packets are properly sliced and redundant.Then,the data is transmitted to the destination node by successive fragment multipath routing.Simulation results show that this routing method can effectively resist selective forwarding attacks and achieve reasonable load distribution,avoiding the reduction of cascading failure robustness due to uneven load distribution in the network.