| As an important branch of Internet of Things(IoT)in the field of intelligent transportation,Internet of Vehicles(IoV)has integrated a variety of disciplines and technologies,which enables the vehicles,roads and Internet to be an integral whole.It achieves intelligent collaboration and interaction of Vehicle-to-X,where X can be Vehicle,Pedestrian,Infrastructure,and Internet.With the application of next generation(5G)wireless communication technology,IoV is moving forward to the direction of intelligent and network.Therefore,multi-network fusion,active information provision,and vehicle control have been the main development trend of On Board Unit(OBU)in many aspects,such as auxiliary driving and other technology-related field.Traditionally,in-vehicle network is considered as a closed network with absolute security.However,severe information security issues may be induced once external devices are permitted to access to closed automotive electronic system,which may pose threats to the confidentiality of IoV communication as well as the life safety of drivers.To address the security issues introduced by multi-network access and fusion,including in-vehicle network,Device-to-Device(D2D),Dedicated Short Range Communications(DSRC),and cellular communication network,this thesis reviewed some existing security schemes for in-vehicle network and OBU from a comprehensive perspective.Motivated by their limitations,the thesis devotes to the study of a secure and reliable OBU as well as its communication scheme,which prevents vehicles from being illegally controlled and further improves the security of multi-network interaction.The main work of this thesis are concluded as follows:(1)A novel OBU with three-level security architecture for internet of vehicles(NOTSA)was proposed.For vehicle attack model,NOTSA was designed with multi-level security areas,and three-layer security protection mechanisms were deployed according to the evaluation of security threat based on ISO 13335 Guidelines for the Management of IT Security(GMITS).Furthermore,the hardware simulation platform was built to verify the feasibility of the design scheme for NOTSA.Meanwhile,the reliability analysis based on Reliability Block Diagrams(RBD),experimental analysis,and comparisons between schemes showed that NOTSA is more reliable.(2)A multi-level security protocol was further proposed on this basis of NOTSA.The protocol mainly contains strong security authentications of external networks and devices,multiprocessor authentication,and hardware isolation,which took full account of time as well as memory overhead,and thus can be deployed in devices with limited hardware resources.In addition,the correctness of proposed protocol was verified using the finite state machine(FSM),and the security of proposed scheme was analyzed by security proof.Apart from theoretical analysis,the performance of NOTSA-based multi-level security protocol was further evaluated using the constructed hardware simulation platform.Experimental results showed that the proposed scheme could achieve better security protection requirements for NOTSA.(3)A secure cooperative communication scheme was proposed on this basis of NOTSA.Under the background of 5G vehicular heterogeneous network(VHN)communication,the proposed scheme implemented cooperative communication among multiple heterogeneous networks which contain IEEE 802.11p-based DSRC network,D2 D communication network,and cellular network(e.g.,5G).In consideration of eavesdropping attacks in heterogeneous networks,mode selection and optimization algorithms for secure cooperative communication were proposed by utilizing stochastic geometry theory and physical layer security technology,which could improve the security of multiple networks access and message transmission.Simulation results and theoretical analysis verified feasibility of the proposed scheme.Meanwhile,compared with IEEE 802.11p-based DSRC and greedy D2 D communication schemes,cooperative communication scheme exhibits better security and reliability. |
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