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Anomaly-based network Intrusion Detection Systems (IDS) are valuable tools for the defense-in-depth of computer networks. Unsupervised or unlabeled learning approaches for network anomaly detection have been recently proposed. Such anomaly-based network IDS are able to detect (unknown) zero-day attacks, although much care has to be dedicated to controlling the amount of false positives generated by the detection system. As a matter of fact, it is has been shown that the false positive rate is the true limiting factor for the performance of IDS, and that in order to substantially increase the Bayesian detection rate, P(Intrusion|Alarm), the IDS must have a very low false positive rate.
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