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The security in MANET has become a significant and active topic
within the research community. In spite of the several attacks
aimed at specific nodes in MANET that have been uncovered, some
attacks involving multiple nodes still receive little attention.
Furthermore, it may also have to do with the fact that no survey or
taxonomy has been done to clarify the characteristics of different
multiple node attacks. This thesis addresses the aforementioned gap
by providing a proper definition and categorization of
collaborative attacks against MANET from the various multiple node
attacks found. Simulation using OPNET Modeler was used to
investigate the performance impact of a collaborative blackhole
attack on a mobile ad hoc network. Network throughput, packet
delivery ratio and end-to-end delay are the performance metrics
used in our result analysis. Based on the analyses of performance
metrics made, we realised the consequences of a collaborative
blackhole attack on MANET. In order to prevent or reduce these
consequences, we also discuss a number of mitigation plans to
counteract the different kinds of collaborative attacks.
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