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  • Research Article
  • Open Access

Network Anomaly Detection Based on Wavelet Analysis

EURASIP Journal on Advances in Signal Processing20082009:837601

  • Received: 1 September 2007
  • Accepted: 2 June 2008
  • Published:


Signal processing techniques have been applied recently for analyzing and detecting network anomalies due to their potential to find novel or unknown intrusions. In this paper, we propose a new network signal modelling technique for detecting network anomalies, combining the wavelet approximation and system identification theory. In order to characterize network traffic behaviors, we present fifteen features and use them as the input signals in our system. We then evaluate our approach with the 1999 DARPA intrusion detection dataset and conduct a comprehensive analysis of the intrusions in the dataset. Evaluation results show that the approach achieves high-detection rates in terms of both attack instances and attack types. Furthermore, we conduct a full day's evaluation in a real large-scale WiFi ISP network where five attack types are successfully detected from over 30 millions flows.


  • Intrusion Detection
  • Anomaly Detection
  • Signal Processing Technique
  • Attack Type
  • Wavelet Approximation

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Authors’ Affiliations

Information Security Center of Excellence, The University of New Brunswick, Fredericton, NB, E3B 5A3, Canada


© W. Lu and A. A. Ghorbani. 2009

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.