HOTP is an HMAC-based One Time Password Algorithm. It is a cornerstone of Initiative For Open Authentication Initiative for Open Authentication.

HOTP was published as an informational RFC 4226 in December 2005, documenting the algorithm along with a Java implementation.

Since then, the HOTP algorithm has been adopted by many companies worldwide.

The HOTP algorithm is a freely available open standard.

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« This page (revision-6) was last changed on 12-Jul-2017 12:46 by jim