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Alert correlation is a process that analyzes the alerts produced by one or more intrusion detection systems and provides a more succinct and high-level view of occurring or attempted intrusions. Several alert correlation systems use pairwise alert correlation in which each new alert is checked with a number of previously received alerts to find its possible correlations with them. An alert selection policy defines the way in which this checking is done. There are different alert selection policies such as select all, window-based random selection and random directed selection. The most important drawback of all these policies is their high computational costs. In this paper a new selection policy which is named Enhanced Random Directed Time Window (ERDTW) is introduced. It uses a limited time window with a number of sliding time slots, and selects alerts from this time window for checking with current alert. ERDTW classifies time slots to Relevant and Irrelevant slots based on the information gathered during previous correlations. More alerts are selected randomly from relevant slots, and less or no alerts are selected from irrelevant slots. ERDTW is evaluated by using DARPA2000 and netforensicshoneynet data. The results are compared with other selection policies. For LLDoS1.0 and LLDoS2.0 execution times are decreased 60 and 50 percent respectively in comparing with select all policy. While the completeness, soundness and false correlation rate for ERDTW are comparable with other more time consuming policies. For larger datasets like netforensicshoneynet, performance improvement is more considerable while the accuracy is the same

Time Window Management for Alert Correlation using Context Information and Classification