OSSEC HIDS is an Open Source Host-based Intrusion Detection System. OSSEC performs log analysis, integrity checking, rootkit detection, real-time alerting and active response.
Intrusion Detection is the process or techniques used to detect attacks on a specific network, system or application. Most intrusion detection tools not only detect attacks, but also software misuse, policy violations and other forms of inappropriate activities.
A Host-based IDS performs intrusion detection from within the systems you want to protect. Some of these tools perform log analysis, others spyware detection, while others perform virus detection.
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