Security Audit Logging

Overview

Audit logs should capture events such as authentication, privilege changes, configuration changes, data access, key operations, transaction decisions, administrative actions, and control failures. Useful records include reliable time, actor, target, action, result, and context.

Logging everything without design creates cost, privacy exposure, noise, and difficult investigations. Logs can also be altered, lost, delayed, or rendered ambiguous by shared accounts, inconsistent clocks, missing identifiers, or untracked service actions.

Teams should define required events, normalize identifiers, synchronize time, protect integrity, restrict access, retain proportionately, and monitor gaps. Sensitive values and secrets must be excluded or masked, while retrieval and incident procedures are tested before evidence is needed.

Security audit logging records security-relevant events so actions, changes, access, and incidents can be investigated, monitored, and attributed. Security Audit Logging must define its objective, scope, criteria, system or control population, evidence period, test method, assessor independence, exceptions, and required remediation or reporting. Reliable results for Security Audit Logging depend on representative evidence, reproducible sampling, qualified judgment, traceable findings, named owners, deadlines, and verification that corrective actions work. Security audit logs are reliable evidence only when event coverage, identity, time, integrity, privacy, retention, and investigation usability are deliberately engineered.

Implementation of Security Audit Logging should map Security audit logging records security-relevant events so actions, changes, access, and incidents can be investigated, monitored, and attributed to the applicable entity, product, customer, transaction, and jurisdictional scope. Evidence for changes, access, and and incidents can be investigated should preserve the governing requirement, policy version, control execution, exception decision, owner, and review date. Material changes affecting the Security Audit Logging context and changes, access, and and incidents can be investigated should trigger reassessment instead of silent reuse of an outdated conclusion.