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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.

翻译 - OSSEC是基于开源主机的入侵检测系统，它执行日志分析，文件完整性检查，策略监视，rootkit检测，实时警报和主动响应。