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Today, ssecurity is a major concern. Cloud computing and Intrusion Detection and Prevention Systems are one such measure to mitigate these attacks. Different researchers have proposed different IDSs time to time some of these IDS's combine features of two or more IDSs which are called as Hybrid Intrusion Detection Systems. Most of the researchers combine the features of Signature based detection methodology and Anomaly based detection methodology. For a signature based IDS if an attacker attacks slowly and organized, the attack may go undetected through the IDS, as signatures include factors which are based on duration of the events and the actions of attacker do not match.
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