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The paper discusses intrusion detection systems built using ensemble approaches, i.e., by combining several machine learning algorithms. The main idea is to exploit the strengths of each algorithm of the ensemble to obtain a robust classifier. Network attacks can be divided into four classes: probe, remote to local, denial of service, and user to root. Each module of the ensemble designed in this work is itself an ensemble created by using bagging of decision trees and is specialized on the detection of one class of attacks. Experiments highlighted the efficiency of the approach and showed that increased accuracy can be obtained when each class of attacks is treated as a separate problem and handled by specialized algorithms.
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