| Driven by technical means such as 5G communications,autonomous driving,the Internet of Things,and artificial intelligence,flying cars have attracted widespread attention as a new type of transportation operation tool.The multi-party collaborative and interconnected urban air traffic information network provides intelligent services for flying cars in terms of information interaction,route planning and safety warning.As network nodes,flying cars will provide information support for intelligent transportation systems.Since the wireless communication channel is a shared medium,its open nature will pose a potential threat to the identity information of flying cars and cause a series of security issues.The field of intelligent transportation has become a fertile ground for big data,and the application of big data to the intelligent transportation system also has many benefits,so data sharing is inevitable.However,the location,trajectory and other information about flying cars in the massive data have a close relationship with the identity information.Therefore,the establishment of a secure identity information protection mechanism for flying cars has become the current research focus.Airspace is an indispensable environmental space for the passage of flying cars.Based on many factors,layered airspace performs best.In this thesis,the hierarchical airspace is regarded as the conceptual structure of the passage of flying cars.A passing airspace layer is set at a certain height at intervals,and several basic communication units will be deployed on each layer.This thesis proposes a method for protecting the identity information of flying cars based on blockchain,which realizes the protection of the identity information of flying cars from three aspects: information storage,information sharing and information transmission.First,a storage authentication model based on the consortium blockchains is constructed.In the information storage stage,hash algorithm and proxy re-encryption technology are used to generate the anonymous pass identity and cipher text identity information of the flying car respectively,and the Merkel Patricia tree structure is used to associate and save it to the storage blockchain,through the anonymous pass identity Search the ciphertext.In the information sharing stage,the access control to the identity information of flying cars is achieved through proxy re-encryption technology and smart contracts.Information is shared in cipher text,and only authorized persons can decrypt it.In the information transmission stage,a layered authentication model is constructed to protect the true identity of flying cars by establishing multiple identity protection mechanisms.In the authentication model,each layer of airspace constructs an authentication blockchain composed of the basic communication unit of this layer as nodes to authenticate the anonymous passing identity of flying cars entering the airspace layer.When flying cars communicate,they generate temporary communication identities with random changes based on their anonymous passing identity and the airspace layer where they are located,and use the temporary communication identities to complete the information interaction between flying cars.The authentication blockchain verifies the legitimacy of the temporary communication identity through Merkel certification.Finally,through the security analysis of the scheme in this thesis,it is proved that the scheme can meet the safety requirements of flying cars. |
