OSSEC is an Open Source Host-based Intrusion Detection System that performs log analysis, file integrity checking, policy monitoring, rootkit detection, real-time alerting and active response.
It runs on most operating systems, including Linux, MacOS, Solaris, HP-UX, AIX and Windows.
Backed by Trend Micro's Global Support Team, we provide paid Premium Commercial Support plans that give OSSEC customers fast turn around for their mission critical issues.
If you are new to OSSEC and would like to contribute to the project we welcome your help.
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PCI with OSSEC