RFC 4226 on HOTP: An HMAC-Based One-Time Password Algorithm

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        RFC 4226

        Title:      HOTP: An HMAC-Based One-Time Password Algorithm
        Author(s):  D. M'Raihi, M. Bellare, F. Hoornaert, D. Naccache,
                    O. Ranen
        Status:     Informational
        Date:       December 2005
        Mailbox:    dmraihi@verisign.com, mihir@cs.ucsd.edu,
                    frh@vasco.com, david.naccache@gemplus.com
        Pages:      37
        Characters: 77117
        Updates/Obsoletes/SeeAlso:    None

        I-D Tag:    draft-mraihi-oath-hmac-otp-04.txt

        URL:        ftp://ftp.rfc-editor.org/in-notes/rfc4226.txt

This document describes an algorithm to generate one-time password
values, based on Hashed Message Authentication Code (HMAC).  A
security analysis of the algorithm is presented, and important
parameters related to the secure deployment of the algorithm are
discussed.  The proposed algorithm can be used across a wide range of
network applications ranging from remote Virtual Private Network (VPN)
access, Wi-Fi network logon to transaction-oriented Web applications.

This work is a joint effort by the OATH (Open AuTHentication)
membership to specify an algorithm that can be freely distributed
to the technical community.  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 memo provides information for the Internet community.  It does
not specify an Internet standard of any kind.  Distribution of this
memo is unlimited.

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Joyce K. Reynolds and Sandy Ginoza
USC/Information Sciences Institute

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