I did a quick search through Amazon to see what books are talking about OSSEC since we published the OSSEC Host-Based Intrusion Detection Guide in February of 2008. To remind everyone, OSSEC is an Open Source Host-based Intrusion Detection System. It performs log analysis, file integrity checking, policy monitoring, rootkit detection, real-time alerting and active response. Here is a quick rundown of what I have found based on my Amazon search: