Abstract: Mobile Ad hoc Network (MANET), a wireless network is mainly deployed over a restricted or remote area. The decentralized, self-organized & infrastructure-less design make them more susceptible to various security hazards. One of them is malignant node or selfish node attack. In this paper, a survey is done on several techniques to lessen these attacks by making network more secure and enhancing the overall performance of the network.

Keywords: MANET, survey, security services, attacks, defense mechanisms.