Defending MANETs against flooding attacks for military applications under group mobility

MANET is an assembly of mobile nodes having the capability of configure any momentarily network without the assistance of any established infrastructure or centralized supervision. Due to the self-arrangement and self maintenance abilities, MANETs become highly vulnerable to various kinds of attacks. So, Security challenges have become a key concern to provide secure communication between mobile nodes. Flooding attack is one of the security threat in which the intruder will overload the network with worthless packets to misuse the bandwidth and resources of the network. In this paper a clustering behavior based reputation mechanism is proposed to identify the flooding malicious nodes in military battlefield network. As in battlefield situation, mainly Group Mobility model is followed, so grouping of nodes in clusters have various advantages. Reputation (assessment of its behavior in the network) of a node is calculated at cluster heads. This strategy has double nature, hence it efficiently fix the false detection of genuine nodes as malicious ones. Strategy is simulated in NS2. Performance of new scheme is compared with AODV protocol based on various performance metrics it is noticed that proposed strategy has better performance in terms of various metrics.