Research And Simulation On Key Management Reconfiguration Technologies For Space Information Network

Space information network is composed of satellites in orbit.It can provide integrated communication services for a variety of tasks,such as weather,environment and disaster monitoring,resource survey,topographic mapping,reconnaissance,communication,broadcast and scientific exploration,etc.Space information network occupies an extremely important position in the field of wireless communication and has a broad applicative prospect.However,due to space information network,fixed nodes change in topology frequently,distance transmission and other inherent characteristics,which makes space information network will be subject to more security threats in comparison with traditional networks.So in space information network,security issues get more and more attention,and key management as the basis for space information network security has become a hot topic at present.The characteristics being combinated with security requirements in space information network,a reconfigurable key management scheme for space information network is proposed.Algorithm is divided into three phases.In the phase of initialization,combination of the characteristics of space information network,it sets a network layer security architecture for key management architecture.There are the backbone network layer,high rail-access layer and low-access layer in the security architecture.In terms of key management settings,the backbone network layer,high rail-access layer rand low-access layer use its own key management scheme,based on dynamic cluster.Meanwhile,adding the trust mechanism,each node monitors its neighbors' abnormal behavior,the credit value assessment to ensure network security.In the key management initiative updating phase,the backbone of the network layer,with calculating the value of the credit for the node,the offline ground center adjusts(k,n),both to ensure the security of the network and to reduce the computational overhead of the network.Members of the high rail-access layer with a credit value based on the assessed value of neighbors,reduce or increase the appropriate certificates and cycle;In passive key reconstruction phase,a key node failures or a lot of backbone node are attacked,respectively,it has to set the new key management to to ensure the network safe and efficient.The network simulation software NS2 was adopted to evaluate the efficiency and invulnerability of the proposed algorithm.The simulation results show that the proposed algorithm can improve the quality of services,enhance the ability of survivability,fault tolerance and failure recovery,making the network survive continuously.