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

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HOTP: An HMAC-Based One-Time Password Algorithm (RFC 4226, )

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

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https://datatracker.ietf.org/doc/html/rfc4226

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IETF Datatracker

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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.

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