In our paper to provide security to 4G networks, authentication protocol is provided in which authentication messages are exchanged among User Equipment, Mobility Management Equipment and Home Subscriber Server. In order to provide a fast authentication, we use a trust aware handoff algorithm to select the handoff access point (AP). The nodes which are already present in the network authenticate the joining node using this algorithm. Based on the trust level of the nodes, the nodes perform the handoff to BS. Completing authentication, a local authentication agent perform re authentication on request by mobile user to check whether the identity is legal or not. The re-authentication is carried in the form of iterative fast re-authentication process.
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