Securing MANET against Co-operative Black Hole Attack and Its Performance Analysis - A Case Study

Mobile Ad-hoc Network (MANET) is an autonomous system of randomly moving nodes where every node acts as host and router to maintain the network functionality. Ad-hoc on demand Distance Vector (AODV) is one of the principal routing protocols which may be get insecure due to malicious nodes present inside the network. Such malicious nodes affect the network performance severely by dropping all the data packets instead of forwarding it to intended receiver. It is called as "Co-Operative Black hole Attack" In this paper one detection and defense mechanism is proposed to eliminate the intruder that carry out black hole attack by taking decision about safe route on basis of Normal V/S Abnormal (anomaly) activity". This anti-prevention system checks route reply against fake reply, named as "Malicious Node Detection System for AODV (MDSAODV)". In this paper we analyze the network performance without, with one and multiple (two) malicious nodes, by varying their location. The network performance for MDSAODV is again analyzed under same scenarios through NS-2 simulation.

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