# SC-23 Session Authenticity — NIST 800-53 Rev5 control

> FedRAMP Consolidated Rules for 2026 v2026.07.14.01 · updated 2026-07-14
> Canonical page: /control/sc-23

Canonical id: `sc-23` · family `SC`

> Protect the authenticity of communications sessions.

_Control title and statement: NIST SP 800-53 Rev5 catalog (the pinned commit is in `/api` under `control_text`). The FedRAMP rules reference these controls by id only; everything below is what FedRAMP says about this id._

## Rev5 baseline membership

- certification class C
- certification class D

## Key Security Indicators that reach it

- `KSI-IAM-APM` — Adopting Passwordless Methods (Identity and Access Management)
  Secure passwordless methods are used for user authentication and authorization when feasible, otherwise strong passwords with phishing-resistant MFA is used.
- `KSI-IAM-ELP` — Ensuring Least Privilege (Identity and Access Management)
  Identity and access management measures are used and persistently reviewed to ensure each user or device can only access the resources they need.
- `KSI-IAM-JIT` — Authorizing Just-in-Time (Identity and Access Management)
  A least-privileged, role and attribute-based, and just-in-time security authorization model is used and persistently reviewed for all user and non-user accounts and services.
- `KSI-SVC-SIN` — Securing Information (Service Configuration)
  Information is encrypted or otherwise secured from unwanted access or modification.
- `KSI-SVC-VCM` — Validating Communications (Service Configuration)
- `KSI-SVC-VRI` — Validating Resource Integrity (Service Configuration)
  Use cryptographic methods to validate the integrity of machine-based information resources.

## FedRAMP guidance

_No FedRAMP-specific guidance attaches to this control._