Research On Privacy Protection Technology In Vehicular Ad Hoc Network

Vehicular Ad-hoc Network(VANET),as an important part of the city’s intelligent transportation system,plays an important role in solving the problems derived from the large number of vehicles(such as parking difficulties,traffic congestion and safety accidents).Therefore,the application value and development prospect of VANET have been widely recognized.However,the low-bandwidth,short-distance transmission,and high-dynamic topology wireless communication features of VANET provide attackers with the opportunity for data tampering and forgery,which makes users personal privacy leakage such as vehicle owner information and travel route information threat,and then affects user’s life and property safety.In recent years,whether in industry or academia,relevant researchers have done a lot of work on privacy protection of in vehicle networks,proposed a series of solutions,and achieved some results.But the traditional solutions generally have problems such as redundant design,complicated calculations,and imperfect scenarios.It is difficult to be widely applied to the vehicle network environment with increasing scale and rich private information.This paper focuses on improving the security and efficiency of privacy protection technology in VANET.The main research contents are as follows:(1)Based on the theoretical ideas of identity-based cryptosystems and bilinear pairing theory,a privacy protected batch anonymous authentication scheme is proposed.In this scheme,anonymity of vehicle identity and signature of message are completed by the tamper proof device in the on board unit and the trust authority,the scheme can reduce the load of trust authority,solve the bottleneck problem of computing,and improve the efficiency of authentication between vehicles.Cryptography security algorithm of the existing vehicle network communication is improved and optimized,and the privacy protection of VANET is strengthened.(2)Based on the theoretical idea of bilinear pairing knowledge in elliptic curves,a conditional privacy protection authentication scheme is proposed.In this scheme,the tamper-resistant device in the vehicle unit is moved to the roadside unit,so as to reduce the installation cost of the tamper-resistant device;the roadside unit and the trust authority cooperate to complete message signature and authentication work,effectively reducing the calculation pressure of the vehicle unit,on the basis of ensuring the privacy protection of users,reducing the calculation complexity and improving the efficiency of vehicle certification.