Congestion Control And Searchable Encryption Of Data In Vehicle Ad-hoc Network

With the development of automobile intelligence,people have new definitions and requirements for vehicle function and safety.The application of vehicular ad-hoc network(VANET)technology builds a foundation for its implementation,and also attracts researchers to study the interoperability and cooperation of vehicle dataIn VANET,network quality will directly affect data interoperability,and data congestion is the main aspect of network quality.Generally,the solution to data congestion is to adopt a rate adaptive routing protocol.This method will reduce the transmission rate or stop sending congestion occurs.Although it can solve the problem of data congestion,it will greatly reduce the throughput of the network.On the other hand,in the aspect of vehicle data cooperation,it is necessary to ensure data security and operability for vehicle data cooperation.However,the existing multi-user searchable encryption technology has some problems,such as keys too many and easy leakage,the tokens and keywords not having privacy,and the server treason.This paper has a classification study for the above two types of problems.(1)Aiming at the problems existing in the congestion control technology of vehicular network,this paper proposes a congestion avoidance measure based on bandwidth awareness(BACA)which uses existing AODV routing protocol.BACA can avoid data congestion in advance in the process of path discovery,solve the congestion problem caused by busy communication and small residual bandwidth,and improve the network throughput.Finally,the urban road network model is established by SUMO(simulation of urban mobility).The vehicle movement model is introduced,and the NS2 network simulation tool is used for experimental simulation and comparison.The results show that Baca has stable and low transmission delay in the traffic network with high vehicle density and large traffic volume,and is superior to other protocols in terms of data delivery rate and network throughput.(2)Aiming at the problems existing in the searchable encryption technologies,this paper proposes a searchable encryption based on vehicle group cooperation(VCSE)method by using asymmetric key agreement mechanism.It uses the aggregate key generation algorithm,random number and hash function to solve the problem of weak security of search token and keyword.Finally,the security and correctness of VCSE are proved by algorithm.At the same time,the computing cost of VCSE algorithm in each stage is simulated by using PBC(Pairing-Based Cryptography)library,and the related protocols are compared in terms of algorithm complexity and performance.The results show that VCSE method can realize the equal cooperation and sharing among multi-vehicle users,improve the privacy and security of retrieval token and index keywords,and resist server treason.