RFC 1938 · PROPOSED STANDARD · 1996
WED · 29 JUL 2026
A One-Time Password System
Overview
RFC 1938, “A One-Time Password System”, is a Proposed Standard document published in May 1996 by N. Haller, C. Metz. It has been obsoleted by RFC 2289 — refer to the newer document for the authoritative version. The canonical text is published by the RFC Editor.
Abstract
This document describes a one-time password authentication system (OTP). [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 1938 is hosted at rfc-editor.org. Available in TXT,HTML.
Relationships to other RFCs
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