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AC-17(2) AC · Access Control

Protection of Confidentiality and Integrity Using Encryption

LOW ✓ MODERATE ✓ HIGH
1 Overlay 3 Related Controls
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Requirements NIST SOURCE

Implement cryptographic mechanisms to protect the confidentiality and integrity of remote access sessions.

Discussion (NIST Supplemental Guidance)

Virtual private networks can be used to protect the confidentiality and integrity of remote access sessions. Transport Layer Security (TLS) is an example of a cryptographic protocol that provides end-to-end communications security over networks and is used for Internet communications and online transactions.

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 AC-17(2) 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. cryptographic mechanisms are implemented to protect the confidentiality and integrity of remote access sessions.

Examine

[SELECT FROM: Access control policy; procedures addressing remote access to the system; system design documentation; system configuration settings and associated documentation; cryptographic mechanisms and associated configuration documentation; system audit records; system security plan; other relevant documents or records].

Interview

[SELECT FROM: System/network administrators; organizational personnel with information security responsibilities; system developers].

Test

[SELECT FROM: Cryptographic mechanisms protecting confidentiality and integrity of remote access sessions].

Overlays

Showing the OT/ICS overlay for the parent control AC-17 — see the AC-17(2) 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)
  • Added: (9)

MODERATE

  • Base control: Included (matches standard baseline)
  • Included: (1) (2) (3) (4)
  • Added: (9) (10)

HIGH

  • Base control: Included (matches standard baseline)
  • Included: (1) (2) (3) (4)
  • Added: (9) (10)

STIGs & CCIs

No STIG checks or CCI mappings are currently loaded for AC-17(2). 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

  • Access control policy
  • system security plan

Configuration

  • system design documentation
  • system configuration settings and associated documentation
  • cryptographic mechanisms and associated configuration documentation

Testing

  • Cryptographic mechanisms protecting confidentiality and integrity of remote access sessions

Other Records

  • procedures addressing remote access to the system
  • system audit records
  • other relevant documents or records