Abstract: The Mobile Ad-hoc Network (MANET) is a moveable wireless network that can transfer the information from source to destination. The recent research this network is widely used all around the wireless network because it does not require any fixed wired network to establish communication between the source and the destination. The major problem in MANET is black hole attack, a malicious node utilizes its routing protocol in order to announce itself for having the direct path to the destination node. The problem in open communication broadcasting the mobile ad-hoc network has some security limitations there are the option of information leakage in the wireless network. The propose system to identify and prevent the both blackhole & grayhole attack in MANET grayhole attack more than one node collude to each other hence this attack is more challenging to recognize. The main target of propose algorithm is to measure the impact of black hole attack and gray holeattack detection on the MANETís using secure algorithm combine with AODV routing protocol. The proposed system investigates the effects of the cooperative gray and black hole attack against AODV. The gray hole and black hole identification based on control packet algorithm. The Proposed method will combine secure Ad hoc On-demand Distance Vector (SAODV) with Elliptic Curve Cryptography (ECC) routing protocol. The experimental result shows the better performance compare with existing routing protocol.

Keywords: Mobile ad-hoc network, secure Ad hoc On-demand distance Vector, Elliptic Curve Cryptography, Ad hoc On-demand distance Vector.