What is the role of correlation analysis in intrusion detection?

Correlation analysis plays a critical role in intrusion detection systems by identifying relationships between multiple events. This approach enables the detection of complex security incidents that may not be evident when examining isolated events. For example, an intrusion detection system might capture various log entries from different sources, such as firewalls, servers, and intrusion detection systems themselves. Through correlation analysis, the system can discern patterns or links between these events, helping to unveil sophisticated attack vectors or coordinated malicious activities that might go unnoticed individually.

By correlating events, security analysts can gain insights into the nature of the attack, its origin, and its impact on the network. This understanding aids in developing appropriate responses, fortifying defenses against future incidents, and generally enhancing overall security posture.