Current prevention techniques provide restrictive responses that may take a local reaction in a limited information system infrastructure. In this paper, an in depth and comprehensive approach is introduced for responding to intrusions in an efficient way. This approach considers not only the threat and the architecture of the monitored information system, but also the security policy. The proposed reaction workflow links the lowest level of the information system corresponding to intrusion

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... ction mechanisms, including misuse and anomaly techniques, and access control techniques with the higher level of the security policy. This reaction workflow evaluates the intrusion alerts at three different levels, it then reacts against threats with appropriate counter measures in each level accordingly.