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RFC 6238

"TOTP: Time-Based One-Time Password Algorithm", May 2011

Canonical URL:
http://www.rfc-editor.org/rfc/rfc6238.txt
This document is also available in this non-normative format: PDF.
Status:
INFORMATIONAL
Authors:
D. M'Raihi
S. Machani
M. Pei
J. Rydell
Stream:
IETF
Source:
NON WORKING GROUP

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Abstract

This document describes an extension of the One-Time Password (OTP) algorithm, namely the HMAC-based One-Time Password (HOTP) algorithm, as defined in RFC 4226, to support the time-based moving factor. The HOTP algorithm specifies an event-based OTP algorithm, where the moving factor is an event counter. The present work bases the moving factor on a time value. A time-based variant of the OTP algorithm provides short-lived OTP values, which are desirable for enhanced security. The proposed algorithm can be used across a wide range of network applications, from remote Virtual Private Network (VPN) access and Wi-Fi network logon to transaction-oriented Web applications. The authors believe that a common and shared algorithm will facilitate adoption of two-factor authentication on the Internet by enabling interoperability across commercial and open-source implementations. This document is not an Internet Standards Track specification; it is published for informational purposes.


For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 4844.


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