OCRA: OATH Challenge-Response Algorithm, June 2011
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This document describes an algorithm for challenge-response authentication developed by the Initiative for Open Authentication (OATH). The specified mechanisms leverage the HMAC-based One-Time Password (HOTP) algorithm and offer one-way and mutual authentication, and electronic signature capabilities. 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.