Web servers which provide Geographical Information System (GIS) services are very vulnerable against attacks exploiting web-based programming errors. A traditional Intrusion Detection System (IDS), however, has limitations to detect web-based attacks because they usually use signature-based IDS. Therefore, we propose IDS based on Hidden Markov Model (HMM) for securing GIS web servers. We adopt HMM which has been achieved good performance in pattern recognition and intrusion detection. We demonstrate effectiveness and efficiency of our proposed system by carrying out several experiments.
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