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IA-2(8) IA · Identification and Authentication

Access to Accounts — Replay Resistant

✓ LOW ✓ MODERATE ✓ HIGH
1 Overlay 0 Related Controls
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Requirements NIST SOURCE

Implement replay-resistant authentication mechanisms for access to [one of: privileged accounts; non-privileged accounts].

Discussion (NIST Supplemental Guidance)

Authentication processes resist replay attacks if it is impractical to achieve successful authentications by replaying previous authentication messages. Replay-resistant techniques include protocols that use nonces or challenges such as time synchronous or cryptographic authenticators.

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 IA-2(8) 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. one or more of the following PARAMETER VALUES is/are selected: {privileged accounts; non-privileged accounts};
  2. replay-resistant authentication mechanisms for access to <IA-02(08)_ODP SELECTED PARAMETER VALUES> are implemented.

Examine

[SELECT FROM: Identification and authentication policy; system security plan; procedures addressing user identification and authentication; system design documentation; system configuration settings and associated documentation; system audit records; list of privileged system accounts; other relevant documents or records].

Interview

[SELECT FROM: Organizational personnel with system operations responsibilities; organizational personnel with account management responsibilities; organizational personnel with information security responsibilities; system/network administrators; system developers].

Test

[SELECT FROM: Mechanisms supporting and/or implementing identification and authentication capabilities; Mechanisms supporting and/or implementing replay-resistant authentication mechanisms].

Overlays

Showing the OT/ICS overlay for the parent control IA-2 — see the IA-2(8) entries within each baseline below.

OT/ICS Overlay SP 800-82r3

NIST SP 800-82r3 Appendix F, Table 22. Blank baseline means the control/control enhancement is not selected in that initial OT baseline.

LOW

  • Base control: Included (matches standard baseline)
  • Included: (1) (2) (8) (12)

MODERATE

  • Base control: Included (matches standard baseline)
  • Included: (1) (2) (8) (12)

HIGH

  • Base control: Included (matches standard baseline)
  • Included: (1) (2) (5) (8) (12)

STIGs & CCIs

No STIG checks or CCI mappings are currently loaded for IA-2(8). 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

  • Identification and authentication policy
  • system security plan

Configuration

  • system design documentation
  • system configuration settings and associated documentation

Testing

  • Mechanisms supporting and/or implementing identification and authentication capabilities
  • Mechanisms supporting and/or implementing replay-resistant authentication mechanisms

Other Records

  • procedures addressing user identification and authentication
  • system audit records
  • list of privileged system accounts
  • other relevant documents or records