Certificateless Privacy-Preserving Authentication Protocol for Vehicular Networks based on the SM2 Algorithm
As the foundation of most intelligent transportation systems, Vehicular Ad-Hoc Network (VANET) has garnered widespread attention for its ability to effectively improve traffic management and enhance road safety.However, due to the open nature of wireless communication environments, nodes within VANET are vulnerable to privacy breaches.Numerous Conditional Privacy-Preserving Authentication ( CPPA) protocols have been proposed to address privacy concerns.However, these protocols primarily rely on traditional signature algorithmsna, leading to complex issues with certificate management and key storage.To address these challenges, this paper presents a VANET-specific CPPA protocol based on the SM2 signature algorithm, which is a standard cryptographic algorithm in China, and incorporates the concept of certificateless cryptography.The proposed protocol aims to reduce communication overhead while avoiding the complexities of certificate management and key storage.Additionally, it ensures that in the presence of malicious vehicle users, a trusted authority can trace their real identities and revoke their privileges.Security proofs and analyses demonstrate that the protocol exhibits high security levels and satisfies requirements such as message integrity, anonymity, traceability, and revocability.Finally, comparative simulations with three recent similar privacy protocols demonstrate the superior communication and computational efficiency of the proposed protocol.
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