| Software-defined vehicular networks(SDVN)is mainly to improve the road safety and traffic efficiency in traditional vehicular networks by taking use of its brand new structure.However,due to the feature of openness,the security in the communication must be taken into consideration to protect the privacy of vehicles,and prevent malicious users from spreading false messages or damaging the system.Therefore,to ensure the safe and effective message transmission and efficient emergency handling is the key problem,this dissertation studied the privacy-preserving authentication for SDVN,and two schemes are proposed according to the research results.(1)In this dissertation,a weight-based conditional privacy-preserving authentication scheme in SDVN is introduced.By applying the weight-based system,the participation rate of malicious vehicles and communication redundancy are both reduced to ease the computing overhead of entities,which also keeps the communication environment for vehicles clear.The two-step tracing scheme means local controllers do not need to store old parameters to obtain the identities of vehicles,thereby reducing deploying costs and improving the security of data.(2)A secure communication scheme based on multicast mechanism in SDVN is proposed.First of all,the scheme proposes a multicast tree protocol which uses the multicast mechanism to quickly establish the multicast tree after the occurrence of road traffic emergencies,so that the affected vehicles can be informed in time.Then the scheme introduces the signature authentication scheme to ensure the security of multi-party communication,so that the system can achieve security requirements of anonymity,privacy preserving,and traceability.Finally,the security proof of the scheme under random oracle indicates that the scheme can meet the requirements of secure communications in SDVN.The performance comparison of the scheme shows that the scheme has better performance in both computing and communication. |
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