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The Google Authenticator includes implementations of one-time passcode
generators for several mobile platforms as well as a pluggable
authentication module (PAM). One-time passcodes are generated using
open standards developed by the Initiative for Open Authentication
(OATH) (which is unrelated to OAuth).
These implementations support the HMAC-Based One-time Password (HOTP)
algorithm specified in RFC 4226 and the Time-based One-time Password
(TOTP) algorithm specified in RFC 6238.
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