EACAS: An Efficient Anonymous Cross-Domain Authentication Scheme in Internet of Vehicles

With continuous development of the Internet of Vehicles (IoV), intelligence is gradually becoming the mainstream trend of future transportation. However, the increasing number of vehicles and their high mobility also bring greater challenges to privacy and security. Most of the current authentication schemes in IoV focus on a single domain, ignoring the cross-domain requirements brought by high mobility. To address these issues better, we propose an efficient anonymous cross-domain authentication scheme EACAS based on elliptic curve cryptography within the certificate-less cryptography. We incorporate the secret sharing with digital signature to provide the trustworthy authentication for cross-domain vehicles, and the batch verification improves the efficiency of authentication. Besides, we also propose a hierarchical pseudonym method for multidomain scenarios, allowing vehicles to update pseudonyms at arbitrary locations and can be revealed. The formal security proof and analysis demonstrate the security characteristics, and the comprehensive performance evaluation shows the efficiency.