# SHA-1 — NIST cryptographic algorithm deprecation schedule: what is approved, deprecated, and disallowed, and when

For SHA-1, purpose is hashing; current status is Deprecated; planned status is Disallowed (SP 800-131A Rev 3 draft proposes retirement); replacement is SHA-2 or SHA-3; source document is SP 800-131A Rev 2 / Rev 3 draft (via EncryptionConsulting summary), recorded from its source on 2026-08-15.

- **Algorithm:** SHA-1 _(verified: appears in the quote below)_
- **Purpose:** hashing
- **Current status:** Deprecated
- **Planned status:** Disallowed (SP 800-131A Rev 3 draft proposes retirement)
- **Replacement:** SHA-2 or SHA-3
- **Source document:** SP 800-131A Rev 2 / Rev 3 draft (via EncryptionConsulting summary)

## What the source says

> SHA-1 and 224-bit hashes are being retired, but for classical-strength reasons unrelated to the quantum public-key transition.

## Source

- https://www.encryptionconsulting.com/education-center/nist-ir-8547-sp-800-131a-algorithm-transitions/

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/).