Research On Low-Altitude Nodes Authentication Scheme In Space-Aerial-Ground Integrated Network

With the development of AI and driverless technology,VANET has become an irreplaceable part of Intelligent Transportation System(ITS).The traditional network of the ground cannot meet the requirement of transmission,processing and storage among vehicles.Under this circumstance,integrating space and air nodes into the whole network can provide comprehensive traffic information and reduce the transmission delay.The Space-Aerial-Ground Integrated Network can assist self-driving and provide vehicles and RSUs with real-time access and interaction.However,satellites,airships,UAVs and other space nodes joining the integrated network will bring much security threats.Security demands of the Space-Air-Ground Integrated Network can be divided into the following three aspects,identity authentication,privacy protection and data security.This paper focuses on identity authentication and privacy protection of low-altitude nodes,that's UAV.To begin with.Hash fingerprint based Support Vector Domain Description(SVDD)algorithm is used to detect wireless signals of UAV and WiFi,which can detect whether one node is a UAV node.In addition,the standard deviation of the spectrum,wavelet and Gabor features are joint into Multi-transform Domain Feature(MDF)to classify UAV signals,which can recognize the specific version.The simulation results show that MDF has better recognition results than a single feature and can efficiently realize individual recognition.Then,this paper simplifies the Blockchain and puts forward an identity authentication and privacy protection scheme based on Hashchain.This scheme contains two types of blocks,and one is produced by the manager,which records key actions and messages of nodes in one certain zone.Another is the record of a single node,and it records the key actions and messages of itself.To protect the privacy of nodes,Hashchain is combined with pseudonyms.In a local zone,nodes use pseudonyms to communicate with other nodes in the zone,while the manager knows pseudonym and real identities of all nodes in the zone.This paper compares the scheme based on Hashchain with traditional Blockchain,analyzes the security and calculates the delay brought by the scheme using the simulation of SUMO,OMNeT++ and Veins.