In Contrast with traditional networks, ad hoc networks not require any previously built infrastructure, they are distributed and fully self-organized systems. Due to absence of any fixed node, each node acts as a router, providing routing capabilities of the MANET. In a distributed network, with out any infrastructure communicating peers have to rely on the whole network, therefore the proper security hardly can be established. This paper proposes enhancements in Preemptive DSR to provide secured route discovery. This paper evaluates integration of Secured Routing Protocol (SRP) and Secured Message Transmission (SMT) with Preemptive Dynamic Source Routing (PDSR) to get Secured PDSR (S-PDSR), which is capable of secured route discovery.

Key words: MANET, SRP, SMT, PreemptiveDSR