A Comprehensive Performance Study of Authentication Protocols for VANETs

Vehicular Ad Hoc Networks (VANETs) are crucial for enabling intelligent transportation systems and providing secure and efficient communication among vehicles and infrastructure. Authentication protocols play a pivotal role in ensuring message integrity, node legitimacy, and user privacy in VANETs. This paper presents a comprehensive performance analysis of authentication techniques, categorized into five key approaches: cryptography-based, signature-based, verification-based, emerging technology-driven, and lightweight algorithms. Each technique is evaluated based on critical metrics, including scalability, latency, computational overhead, communication overhead, and security features. The results demonstrate the trade-offs among various techniques, such as the scalability of batch-assisted verification, the low latency of TESLA, and the privacy-preserving capabilities of Blockchain-based protocols. While lightweight techniques like PA-CRT and TESLA are ideal for resource-constrained environments, advanced approaches like 5G-SDN Hybrid Authentication provide superior scalability and low latency for high-density traffic scenarios. This study highlights the strengths and limitations of each approach, providing insights into their suitability for different VANET applications. The findings aim to guide researchers and practitioners in selecting and designing robust authentication protocols for next-generation intelligent transportation systems.