Design And Emulation Verification Of Inter-Satellite Security Routing Protocol

In recent years,in order to meet the needs of accessing high-speed Internet anytime and anywhere,the research on the integration of 5G and satellite communication has attracted more and more attention of researchers and industry.LEO Hight-Throughput Satellite has the characteristics of low delay and high bandwidth,which is suitable for integration with 5G.Inter-satellite routing is a core problem to be considered in LEO satellite network.In order to shorten the deployment period of satellite network,the inter-satellite routing protocol can be designed based on OSPF.However,due to the characteristics of high topology dynamics,limited performance of satellite nodes,high delay of inter-satellite links,precious bandwidth resources and great security threats,if OSPF is directly operated in LEO satellite network,it will lead to a large number of routing messages occupying bandwidth,frequent routing calculation,slow routing convergence and even route oscillation.To solve the above problems,this thesis designs an inter satellite secure routing protocol,sat OSPF.The main work is as follows:(1)Aiming at the problems of high dynamics of satellite network topology and high delay of inter-satellite links leading to slow route convergence and consumption of a large amount of communication resources,an OSPF-based inter-satellite routing protocol Sat-OSPF was proposed.Utilizing the predictability of the satellite network topology,routing nodes predict the network topology in advance and actively update the network topology instead of passively receiving link state update messages,thereby greatly reducing the route convergence time;Utilizing the periodicity of the on-off relationship of the link,the destination routing node buffers and multiplexes the link state announcement,thereby greatly reducing the routing convergence time while reducing the amount of protocol control messages sent.(2)Aiming at the problem that Sat-OSPF is vulnerable to malicious attacks due to the openness of satellite network links,a certificateless signature scheme based on elliptic curve is proposed,and the digital signature scheme is used to sign router LSA packets to improve Sat-OSPF security.Aiming at the proposed scheme,its security performance is analyzed theoretically,and then it is proved that its computational overhead is small by simulation.Therefore,the computational overhead,time overhead,and communication overhead generated by using digital signatures in Sat-OSPF have a small impact on protocol performance.(3)Based on STK and EXata's hardware-in-the-loop simulation platform and LEO48 constellation,Sat-OSPF was simulated and verified,and its performance was compared with other protocols.The results show that: under ideal conditions,the Sat-OSPF packet overhead is 86.852% and 86.828% less than that of OSPF and OSPF + respectively,and the route convergence time is reduced by 98.593% ? 99.881% and 22.628% ? 93.444%.This thesis studies and designs a secure inter-satellite routing protocol,Sat-OSPF,which has the characteristics of low communication overhead,fast routing convergence and high security.It has a certain significance for the study of inter satellite secure routing.