Intrusion Detection Systems have undergone rapid growth in power, scope and complexity in their short history. Most IDS share a similar underlying structure: agents reporting detections to a management system. Recent increases in malicious network activity worldwide have precipitated the need for IDS with global scope. These distributed Intrusion Detection Systems multiply the power of a single IDS by marrying an attack correlation engine with an database of events obtained from a large number of geographically dispersed agents. This provides a global view of existing and emerging attacks patterns and security events, allowing rapid notification and facilitating development of countermeasures.
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