Research On Vehicular Ad-hoc Network Information Security Transmission Method

Vehicular Ad-hoc Network(VANET)is a new type of wireless communication network,and its technology has a strong universality.Therefore,all sectors of the community have paid particular attention to it.However,VANET is facing the risk of privacy leaks at the same time.VANET is an open network that carries out communications through broadcast,and attackers can steal users' privacy by stealing the broadcast.When the Road Side Unit transmits the information to the cloud platform,the RSU will be under attack and the cloud server will also leak users' privacy.Based on the in-depth study of VANET information transmission,the paper adopts the information hiding technology to ensure the information security in VANET.The main work of this article is as follows:(1)The basic concepts and information transmission characteristics of the VANET is introduced,the researches at home and abroad are analyzed,and the use of information hiding technology to protect private information by analyzing the common attack models in the VANET is proposed(2)Aiming at the problems of information leakage and privacy theft in the transmission of intranet information in the VANET,a vehicle information hiding algorithm based on improved matrix coding is designed.Firstly,based on the error characteristics of vehicle sensors,a threshold is proposed as a carrier.Then,for the problem that the matrix code hiding algorithm cannot change the carrier at the receiving end,the matrix code embedding method is improved,and a reversible information hiding algorithm based on improved matrix coding is proposed.Finally,through experimental analysis,the improvement of the reversibility,the concealment and security of the improved matrix coding algorithm proposed in this paper,in the safe transmission of VANET information are verified.(3)Aiming at the security of VANET data in the cloud,it is proposed to use homomorphic encryption to encrypt the data,and to hide information in the ciphertext domain to protect private data.Firstly,in view of the risk of data theft during the transmission of VANET information and cloud servers,homomorphic encryption is used in the roadsideinfrastructure to protect the information.Then,for the problem of complicated calculation of information hiding in the homomorphic encrypted ciphertext domain,a grid password is used to implement information hiding in the ciphertext domain to protect user privacy data.Finally,the security and stealth of the algorithm are analyzed through experiments.