Black hole attack in Vehicular Ad Hoc Network is major problem related with the field of computer networking. In this paper we present the performance analysis of the black hole attack in Vehicular Ad Hoc Network. We elaborate the different types of attacks and their depth in ad hoc network. The performance metric is taken for the evaluation of attack which depends on a packet end to end delay, network throughput and network load. The delay, throughput and load are simulated by the help of OPNET 14.5 modeler. The simulation setup comprises of 30 Vehicular nodes moving with constant speed of 10 meter per second. The data rate of Vehicular nodes is 11 Mbps with default transmitting power of 0.005 watts. With On Demand Distance Vector Routing and Optimized Link State Routing the malicious node buffer size is lowered to a level which increase packet drops.

The Diffie-Hellman key algorithm was the first proposed public key algorithm by which two parties can communicate with each other without having any prior knowledge of each other over an insecure communication channel proposed by Harn.et.al. Diffie-Hellman key exchange algorithm is the most famous algorithm to exchange keys over a network but it has some false and drawbacks. So in our work we have proposed a new agreement protocol based on key confirmation as well as Diffie-Hellman algorithm. This protocol also works on the elliptic curve cryptography in asymmetric encryption.