Overview: Integrity Monitoring

Quick Definition

Integrity monitoring is a cybersecurity practice that continuously tracks and detects unauthorized changes to files, systems, or data. This security control works by establishing baseline measurements of critical system components—including file sizes, checksums, permissions, and timestamps—then regularly comparing current states against these known-good baselines to identify any modifications.

When integrity monitoring systems detect discrepancies, they generate alerts that can indicate potential security breaches, malware infections, configuration drift, or unauthorized administrative changes. This capability is particularly valuable for protecting critical system files, configuration files, databases, and application binaries that should remain static under normal operations.

Modern integrity monitoring solutions often integrate with Security Information and Event Management (SIEM) systems and can provide real-time alerting when suspicious changes occur. Many compliance frameworks, including PCI DSS and NIST guidelines, require organizations to implement file integrity monitoring as part of their security controls.

Effective integrity monitoring programs typically focus on high-value targets such as operating system files, security software configurations, log files, and sensitive application data, while filtering out expected changes from legitimate system updates and maintenance activities to reduce false positives.