Intelligent transportation system is being revolutionized with Vehicular AdHoc Network (VANET) which is a subset of MANET (Mobile AdHoc Network). With the transmission for periodic messages like speed, density the environment around the vehicle can be more effective. Routing is the key challenge in Vehicular AdHoc Network, hence to evaluate the density and speed information speed density model is adopted which will be an assistance to choose the subsequent hop forwarding node. Also, providing uncompromised security has always been a main challenge in VANET. Both for reliable communication between two associations, Web Transactions and for assured messaging, efficient Public key Infrastructure is needed as VANET is prone to various attacks which affects its functionality. The black hole attack is examined as lone broadly spread active attacks that detoriates the network performance as an outcome of dropping the data packets by malignant node. Elliptic Curve Cryptography, which is formulated on the reckoning of elliptic curves. ECC programmes are the public key mechanisms that give digital signature, encryption-decryption and key exchange capabilities. This research secures GPSR-SD protocol using Elliptic curve cryptography Diffie Hellman Key Exchange, Digital Signature and encryption and decryption approach which has been simulated using Network simulator 2.35. The focus of this research is to improve the network effectiveness such as Packet delivery ratio, Routing overhead, Throughput, End to End Delay etc. and proving confidentiality, authentication, non repudiation and integrity of the message.

GPSR, GPSR-SD, VANET, MANET, RSU, PDR, NS-2.35, ECC, ECDLP