Abstract

Global spread of Information Technologyincreases security challenges; over intrusion detection system against sophisticated attacks. This has become of paramount importance since single mode intrusion detection systems have a lot of difficulties in protecting Network from sophisticated attackers. However, this paper propose a Multi-Level Based Hybridized Intrusion Detection System whereby the incoming packets will be examinedfor attacks at two layers; both at Network level as Network Intrusion Detection (NID) and further double check those that escape through the initial test at the second level using Bayes' theorem at Host level as Host based Intrusion Detection (HID). This will help to prevent against intrusion, minimize false alarms and maximize the numbers of detected bad events. It handle masses of information (often in real-time) so as to report the abnormal use of networks and computer systems in a real time before it get out of hand.

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