International Journal of Computer Applications
A collection of wireless nodes which exchange various information among each other through wireless links as per the coverage boundary directly or with the support of midway nodes as routers called infrastructure less in ad hoc networks. The Mac 802.11 wireless standard supports multiple data rates at the physical layer. Wireless network is dynamic because of frequent changes take place inside the topology due to mobility or energy loss. Accordingly any node can join or else leave the network in order to that changes in membership causes trust relationship among nodes is a big issue. During this circumstances security is the main concern in ad hoc networks.