Blockchain-Based Messaging for VANETs

An intelligent transport system is indispensable for today's life. It can help to reduce traffic and even the number of accidents. However, it raises several security issues. Providing travelers' privacy and anonymity is essential. We propose a message broadcast protocol for vehicle communication based on the blockchain technology. Eligible vehicles can anonymously report road conditions (e.g. traffic jams, accidents, etc.). We give an efficient solution applying Solana blockchain that provides fast block generation time and supports smart contracts. Blockchain maintains immutability of messages, enables anonymous message submission, moreover assures message unlinkability. Our scheme is identity-based, applying bilinear pairings batch verification of messages is accomplished.