Removal of Black Hole Attack by Implementing Digital Signature and Trust Index Computation in Ad hoc Wireless Networks

Ad hoc wireless networks are the infrastructure less networks. They consist of mobile nodes which move around the network within a given range. Ad hoc wireless networks are prone to attacks. Security is of utmost concern in such networks. One such threat is black hole attack. In black hole attack, a node or nodes exhibit malicious behavior by intercepting the packets and thus disclosing the confidentiality of the message being transmitted. In this paper, the black hole attack is detected and eliminated by modifying AODV protocol.