Secure Routing Against Flooding Attack in MANET

Mobile Ad hoc Network is an autonomous system of mobile nodes connected by wireless links. The communication may be via intermediate nodes from source to destination. On demand routing protocol is superior than different routing Protocols in MANET. The nodes are free to move in the network. MANET faces many attacks because of its characteristics. Now a days the Denial of service attack grown up and disturb whole ad hoc network. Flooding attack is a kind of denial of service attack in which intruder floods (broadcast) exceed packets in the network so the actual communication can’t be kept and traffic will create. After analyzed Ad hoc flooding attack, we proposed a new method for detecting flooding attack and save the network. In our method we use shared secret key for authenticating a communication between nodes and also use challenge response protocol. Our goal is to provide a better security and decreases overhead of routing.