The dynamic changing nature of network topology makes any node in MANET to leave and join the network at any point of time. There are many routing protocols that establish the routes between the nodes in the network. The control towards the management of the nodes in the MANET is distributed. This feature does not give assurance towards the security aspects of the network. There are many routing attacks caused due to lack of security. The routing attack addressed in this paper is the black hole attack. The Black hole attack is that where a malicious node advertises itself as it is having the optimal route to the destination. Most of the Routing protocols do not address the issues of the routing attack. This paper describes a solution strategy which will overcome the black hole attacks in MANETs. The proposed solution is that the nodes authenticate each other by issuing security certificate in digital form to all the other nodes in the network. The proposed method is to be adapted on DSR protocol .This method is capable of detecting and removing black hole nodes in the MANET. KeywordsBlack hole attack, DSR, Security certificate.
The dynamic nature of infrastructure in MANET makes security as a critical issue. Due to mobility of nodes, network is easily affected by several types of attacks. In particular black hole attack cause packet dropping, misrouting the information from source to destination. To prevent a network from the effects of the black hole attack, we propose a most reliable data transfer scheme to detect the black hole nodes in the network and ensure the availability, reliability, confidentiality of the information. First, the proposed scheme detects the black hole node using trust active and node recommendation values. Second, the reliability and confidentiality of the information is achieved by using verifiable secret sharing scheme. The proposed algorithm is implemented on AOMDV protocol. The simulation results show the proposed algorithm achieves the better packet delivery ratio, misbehavior detection efficiency, fewer packets overhead and low end to end delay than the existing schemes.
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