@misc{rfc6238,
    series =    {Request for Comments},
    number =    6238,
    howpublished =  {RFC 6238},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC6238},
    url =       {https://www.rfc-editor.org/info/rfc6238},
    author =    {David M'Raihi and Johan Rydell and Mingliang Pei and Salah Machani},
    title =     {{TOTP: Time-Based One-Time Password Algorithm}},
    pagetotal = 16,
    year =      2011,
    month =     may,
    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.},
}