Mobile Ad-hoc Network (MANET) is a new type of communication network, which can be used for data communication between groups of mobile nodes using wireless channels. The energy constraints, poor protection of nodes in a hostile environment, and the vulnerability of security schemes have been identified as challenges for MANETs. The wireless MANETs face a larger security problem than conventional wired and wireless networks. As per recent research trends, Clustering based approach enables mobile node management, security, fault tolerance, network key management and routing in MANETs....