DSSPS: A dynamic secure service provision scheme in fog-based VANETs

In fog-based VANETs, fog nodes are close to the network edge that analyze data uploaded by vehicles, and then provide value-added services. It is suitable to adopt data sharing schemes to provide value-added services. However, applying existing data sharing schemes directly for service provision in fog-based VANETs has limitations in terms of security and efficiency. Therefore, we propose a dynamic secure service provision scheme in fog-based VANETs called DSSPS. Firstly, we construct an efficient subscription permission authentication mechanism that allows vehicles to request service from different fog nodes after a single subscription at TA. Secondly, a subgroup selecting algorithm is proposed, which effectively reduces the decryption overhead of vehicles. Formal security proof demonstrates DSSPS is secure. At the same time, DSSPS achieves better performance in terms of computation and communication costs.