PFCAS-Paring free certificate less aggregate scheme for ensuring efficient authentication in vehicular Ad-hoc networks

In the emerging world the Vehicular Ad-hoc Network (VANET) plays a vital role in the Intelligent Transportation Sector (ITS). Basically VANET are exposed rapid topology changes, dynamic network environment, intermittent connectivity and fluctuating communication range which leads to security and privacy concerns. To address these issues, in this work, an enhanced pairing free certificate less aggregate authentication scheme is proposed. The proposed method employs Elliptic Curve Cryptography (ECC) instead of bilinear pairing algorithm to reduce the overhead and to provide efficient security in the network. Further, during the communication and authentication phases the message transmission takes place in an aggregate manner which in turn reduces the time and storage in the network. The novelty of the proposed work is that the use of aggregation scheme which reduces the delay during the communication in the network. The formal security analysis is provided to the proposed protocol by using the Random Oracle Model (ROM) to prove the level of security and privacy in the proposed system. The proposed system is compared with various existing system and has improved its performance metrics in terms of computational, communication cost, signing delay, verification delay and message end to end delay. The implementation of the proposed protocol is carried out in NS3 simulator. The simulator results also proves that the proposed protocol improves the transmission overhead by 42.28%, computational cost by 39.45%, communication cost by 49.75%, signing delay by 45.23% and verification delay by 44.35% when it is compared with other existing systems.