RFC 3874 · INFORMATIONAL · 2004
SUN · 14 JUN 2026
A 224-bit One-way Hash Function: SHA-224
Overview
RFC 3874, “A 224-bit One-way Hash Function: SHA-224”, is an Informational document published in September 2004 by R. Housley. The canonical text is published by the RFC Editor.
Abstract
This document specifies a 224-bit one-way hash function, called SHA-224. SHA-224 is based on SHA-256, but it uses a different initial value and the result is truncated to 224 bits. This memo provides information for the Internet community.
What “Informational” means
Published for the general information of the community. It does not define an IETF standard and carries no standards-track status.
Read this RFC
The canonical text of RFC 3874 is hosted at rfc-editor.org. Available in TXT,HTML.
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