SI-21 SI · System and Information Integrity

Information Refresh

LOW MODERATE HIGH
0 Overlays 1 Related Control
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Requirements NIST SOURCE

Refresh [information] at [frequencies] or generate the information on demand and delete the information when no longer needed.

Discussion (NIST Supplemental Guidance)

Retaining information for longer than it is needed makes it an increasingly valuable and enticing target for adversaries. Keeping information available for the minimum period of time needed to support organizational missions or business functions reduces the opportunity for adversaries to compromise, capture, and exfiltrate that information.

Implementation Guidance

Engineering Interpretation

Original engineering commentary written for this explorer — not NIST source text and not authoritative guidance.

No engineering interpretation has been authored for SI-21 yet. This section is architected to receive it — see the Requirements and Assessment sections above for the authoritative NIST source content in the meantime.

Assessment

NIST SP 800-53A REV 5.2.0

Assessment Objectives

  1. the information to be refreshed is defined;
  2. the frequencies at which to refresh information are defined;
  3. the <SI-21_ODP[01] information> is refreshed <SI-21_ODP[02] frequencies> or is generated on demand and deleted when no longer needed.

Examine

[SELECT FROM: System and information integrity policy; system and information integrity procedures; personally identifiable information processing policy; procedures addressing software and information integrity; system design documentation; system configuration settings and associated documentation; information refresh procedures; list of information to be refreshed; system security plan; privacy plan; other relevant documents or records].

Interview

[SELECT FROM: Organizational personnel responsible for refreshing information; organizational personnel with information security and privacy responsibilities; organizational personnel with systems security engineering responsibilities; system developers].

Test

[SELECT FROM: Mechanisms for information refresh; organizational processes for information refresh].

STIGs & CCIs

No STIG checks or CCI mappings are currently loaded for SI-21. This section is architected to display, per product: STIG ID, Finding ID, Severity, Title, Description, Check, Fix, CCI, and NIST control mapping — but nothing is populated here until a real DISA STIG/CCI dataset is ingested.

Learn more about STIG/CCI integration →

Evidence

Potential Evidence — Derived

Categorized from the SP 800-53A "Examine"/"Test" artifact list above by keyword — not an authoritative NIST evidence list.

Policy

  • System and information integrity policy
  • personally identifiable information processing policy
  • system security plan
  • privacy plan

Configuration

  • system design documentation
  • system configuration settings and associated documentation

Testing

  • Mechanisms for information refresh
  • organizational processes for information refresh

Other Records

  • system and information integrity procedures
  • procedures addressing software and information integrity
  • information refresh procedures
  • list of information to be refreshed
  • other relevant documents or records