RFC 4635 · PROPOSED STANDARD · 2006

HMAC SHA TSIG Algorithm Identifiers

Overview

RFC 4635, “HMAC SHA TSIG Algorithm Identifiers”, is a Proposed Standard document published in August 2006 by D. Eastlake 3rd. It updates RFC 2845. It has been obsoleted by RFC 8945 — refer to the newer document for the authoritative version. The canonical text is published by the RFC Editor.

Abstract

Use of the Domain Name System TSIG resource record requires specification of a cryptographic message authentication code. Currently, identifiers have been specified only for HMAC MD5 (Hashed Message Authentication Code, Message Digest 5) and GSS (Generic Security Service) TSIG algorithms. This document standardizes identifiers and implementation requirements for additional HMAC SHA (Secure Hash Algorithm) TSIG algorithms and standardizes how to specify and handle the truncation of HMAC values in TSIG. [STANDARDS-TRACK]

Abstract as published in the RFC, via rfc-editor.org.

What “Proposed Standard” means

An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.

Read this RFC

The canonical text of RFC 4635 is hosted at rfc-editor.org. Available in TXT,HTML.

Relationships to other RFCs
Obsoleted by
RFC 8945
This RFC updates
RFC 2845
Other RFCs from 2006

Who Is Online

In total there are 62 users online: 0 registered, 55 guests and 7 bots.

Most users ever online was 5,555 on 17 Jul 2026, 3:23 am.

Bots: AhrefsBot Applebot Baiduspider Bingbot Other Bot PetalBot SemrushBot

Users active in the past 15 minutes. Total registered members: 372