Overview: Log Integrity

Quick Definition

Log integrity is the assurance that system logs remain accurate, complete, and unaltered from their original state. This cybersecurity principle ensures that audit trails and security records can be trusted for forensic analysis, compliance reporting, and incident response activities.

Maintaining log integrity involves implementing protective measures such as cryptographic hashing, digital signatures, and write-once storage systems that prevent unauthorized modification or deletion of log entries. Organizations typically use centralized logging systems with role-based access controls to limit who can view or manage logs, while automated backup processes ensure logs are preserved even if primary systems are compromised.

Log integrity is critical because attackers often attempt to cover their tracks by deleting or modifying system logs that would reveal their activities. Without reliable logs, security teams cannot effectively investigate incidents, demonstrate compliance with regulations, or understand the full scope of a breach. Strong log integrity measures also support legal proceedings by providing tamper-evident records that can serve as credible evidence in court.