In mobile ad hoc networks, by attacking the corresponding routing protocol,an attacker can easily disturb the operations of the network. For ad hocnetworks, till now many secured routing protocols have been proposed whichcontains some disadvantages. Therefore security in ad hoc networks is acontroversial area till now. In this paper, we proposed a Lightweight andAttack Resistant Authenticated Routing Protocol (LARARP) for mobile ad hocnetworks. For the route discovery attacks in MANET routing protocols, ourprotocol gives an effective security. It supports the node to drop the invalidpackets earlier by detecting the malicious nodes quickly by verifying thedigital signatures of all the intermediate nodes. It punishes the misbehavingnodes by decrementing a credit counter and rewards the well behaving nodes byincrementing the credit counter. Thus it prevents uncompromised nodes fromattacking the routes with malicious or compromised nodes. It is also used toprevent the denial-of-service (DoS) attacks. The efficiency and effectivenessof LARARP are verified through the detailed simulation studies.
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