RFC 2085 · PROPOSED STANDARD · 1997
MON · 14 SEP 2026
HMAC-MD5 IP Authentication with Replay Prevention
Overview
RFC 2085, “HMAC-MD5 IP Authentication with Replay Prevention”, is a Proposed Standard document published in February 1997 by M. Oehler, R. Glenn. The canonical text is published by the RFC Editor.
Abstract
This document describes a keyed-MD5 transform to be used in conjunction with the IP Authentication Header [RFC-1826]. The particular transform is based on [HMAC-MD5]. An option is also specified to guard against replay attacks. [STANDARDS-TRACK]
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 2085 is hosted at rfc-editor.org. Available in TXT,HTML.
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