Secure cloud internet of vehicles based on blockchain and data transmission scheme of map/reduce

Over the past few years, because of the popularity of the Internet of
 vehicles and cloud computing, the exchange of group information between
 vehicles is no longer out of reach. Through WiFi/5G wireless communication
 protocol, vehicles can instantly deliver traffic conditions and accidents to
 the back end or group vehicles traveling together, which can reduce traffic
 congestion and accidents. In addition, vehicles transmit real-time road
 conditions to the cloud vehicle management center, which can also share
 real-time road conditions and improve the road efficiency for pedestrians
 and drivers. However, the transmission of information in an open
 environment raises the issue of personal information security. Most of the
 security mechanisms provided by the existing Internet of vehicles require
 centralized authentication servers, which increase the burden of certificate
 management and computing. Moreover, the road side unit as a decentralized
 authentication center may be open to hacking or modification, but due to
 personal privacy and security concerns, vehicle-to-vehicle is not willing to
 share information with each other. Therefore, this study is conducted
 through blockchain to ensure the security of vehicle-based information
 transmission. Moreover, the elliptic curve Diffie-Hellman (ECDH) key
 exchange protocol and a secure conference key mechanism with direct user
 confirmation combined with the back-end cloud platform Map/Reduce is
 proposed to ensure the identities of Mappers and Reducers that participate
 in the cloud operation, avoid malicious participants to modify the
 transmission information, so as to achieve secure Map/Reduce operations, and
 improves vehicle and passenger traffic safety.