Robust session key generation protocol for social internet of vehicles with enhanced security provision

Social internet of things (SIoT) is an emerging concept that enables the autonomous interactions between social networks and internet of things (IoT). Vehicle-to-grid (V2G) networks are one of the instances of the SIoT. To mitigate privacy and security issues exist in the V2G networks, it is crucial to employ proper security solutions. One of the most important and popular security solutions is the key exchange protocol. During the last decade, several key exchange schemes have been proposed considering the specific requirements of V2G networks. However, the existing schemes have not reached a proper balance between security and efficiency. Therefore, in this paper, after the security assessment of a recent work, we propose a key exchange protocol, which can provide the desired performance and security properties. Rigorous formal security analyses besides the security features, communication overhead, and computational complexity comparisons indicate that the proposed scheme is a robust one to be employed in the V2G networks. To be more specific, in comparison to one of the most secure schemes, the proposed protocol has 84% improvement in execution time and 54% improvement in communication overhead. Furthermore, experiments on realistic platform indicate that the proposed protocol only takes 3 s to be executed by the computationally constrained onboard unit of electric vehicle.