To enhance security scheme for MANET using HMAC

Security has become a primary concern in order to provide protected communication between mobile nodes in a hostile environment. Unlike the wireline networks, the unique characteristics of mobile ad hoc networks pose a number of nontrivial challenges to security design, such as open peer-to-peer network architecture, shared wireless medium, stringent resource constraints, and highly dynamic network topology. These challenges clearly make a case for building multi fence security solutions that achieve both broad protection and desirable network performance. In this paper we use the symmetric key HAMC (message authentication code) in that the key exchange between the node the authorized person only allow to the network to communicate data it should be secure the network.