# Classical algorithms below 112-bit security strength — NIST cryptographic algorithm deprecation schedule: what is approved, deprecated, and disallowed, and when

For Classical algorithms below 112-bit security strength, purpose is all cryptographic purposes; current status is Disallowed; planned status is No change planned (already disallowed under Rev 2); replacement is Algorithms meeting minimum 112-bit security strength; source document is SP 800-131A Rev 2 (March 2019), recorded from its source on 2026-08-15.

- **Algorithm:** Classical algorithms below 112-bit security strength
- **Purpose:** all cryptographic purposes
- **Current status:** Disallowed
- **Planned status:** No change planned (already disallowed under Rev 2)
- **Replacement:** Algorithms meeting minimum 112-bit security strength
- **Source document:** SP 800-131A Rev 2 (March 2019)

## What the source says

> provides more specific guidance for transitions to the use of stronger cryptographic keys and more robust algorithms

## Source

- https://csrc.nist.gov/pubs/sp/800/131/a/r2/final

Last verified: 2026-08-15. Review by: 2027-02-11.
Part of [NIST cryptographic algorithm deprecation schedule: what is approved, deprecated, and disallowed, and when](https://referencesource.org/nist-cryptographic-algorithm-deprecation-schedule/).