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Due to lack of the infrastructure, open peer-to-peer architecture, shared wireless medium, limited resource constraints and highly dynamic topology, MANETs (Mobile Adhoc Networks) are frequently established in insecure environments, which make them more vulnerable to attacks. These attacks are initiated by sharing malicious nodes against different services of network. The binding force in these networks is routing protocol, which is a common target of malicious nodes. MANETs routing protocols are being developed without having security in mind. Ad-hoc On-Demand Distance Vector (AODV) is one such widely used routing protocol that is at present undergo extensive research and development. AODV is based on distance vector routing, but here the updates are shared not on a periodic basis but on an as per demand basis. The control packets contain a hop-count and sequence number field which recognizes the freshness of routing. These fields are editable, so it creates a possible susceptibility that is frequently abused by malicious nodes to advertise false better routes. As well as, transmission of routing updates in form of clear text also reveals crucial information about the network topology, which is again a probable security danger. In this paper we are presenting a novel and practical security mechanism for securing the AODV routing protocol that protects against a number of attacks carried out in MANETs. We will present message digest with secret key mechanism to secure AODV messages, which is very effective, and less power consuming security solution for MANETs.