Designing a PCI-Compliant Log Monitoring System
by F. William Lynch - Manager CTG - Monday, 27 August 2007.
10.5.5 Use file integrity monitoring and change detection software on logs to ensure that existing log data cannot be changed without generating alerts (although new data being added should not cause an alert).
10.6 Review logs for all system components at least daily. Log reviews must include those servers that perform security functions like intrusion detection system (IDS) and authentication, authorization, and accounting protocol (AAA) servers (for example, RADIUS).
Note: Log harvesting, parsing, and alerting tools may be used to achieve compliance with Requirement 10.6.
10.7 Retain audit trail history for at least one year, with a minimum of three months online availability.

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