Privacy-preserving authentication framework using bloom filter for secure vehicular communications

Vehicular ad hoc networks (VANETs) are the future of the intelligent transportation systems (ITS), which aim to improve traffic safety. The received message in VANETs can contain the malicious content that may affect the entire network; hence, these networks are more prone to such attacks. Thus, security is a major consideration before the deployment of such network. In this paper, a secure privacy-preserving authentication framework is proposed, which employs the use of pseudonyms for anonymous communication. A new digital signature scheme and aggregate verification scheme are designed for vehicular communications, and the ID-based signature scheme is used for vehicle-to-RSU communication. The multiple authorities are involved in revealing the identity of the vehicle in case of revocation. The signature verification scheme is improved by the use of bloom filters, and the results achieved by the proposed scheme have been implemented on a simulated environment.