Vehicular ad hoc networks (VANETs) represent a burgeoning research domain with far-reaching implications for enhancing safety, efficiency, and public involvement in transportation systems. Embedded with sensors, processing capabilities, and wireless communication, vehicles stand poised to revolutionize various facets of road safety, operational efficiency, and user engagement. There are, however, big problems with real-time processing of the huge amounts of data sent through vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) channels because VANETs are automatically changing, with inconsistent connectivity and different vehicle speeds. Furthermore, the inherent variability within VANETs compounds the challenge of establishing dependable communication pathways and ensuring efficient data transmission while simultaneously necessitating robust measures to address security concerns such as secure communication protocols, reputation management, and safeguarding against malicious attacks. This paper proposes a scheme to verify the security and high efficiency of message exchange in VANETs by integrating fog computing with blockchain technology. Using the decentralized structure of blockchain and the distributed computing features of fog computing, our proposed framework protects the integrity of data while lowering the costs of storage, computation, and communication. Notably, the proposed scheme is fortified against various forms of attacks, including impersonation attacks, man-in-the-middle (MITM) attacks, and replay attacks.