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The Google Authenticator project includes implementations of one-time passcodegenerators for several mobile platforms. One-time passcodes are generated usingopen standards developed by theInitiative for Open Authentication (OATH)(which is unrelated toOAuth).

This GitHub project is specifically for the Google Authenticator apps whichtarget the Blackberry and iOS mobile platforms.

Other related Google Authenticator opensource projects can be found as notedbelow:

• Android app.
• Pluggable Authentication Module, aka PAM.

There areno account backups in any of the apps by design.

These apps are not on the app stores, and their code has diverged from what's inthe app stores, so patches here won't necessarily show up in those versions.

These implementations support the HMAC-Based One-time Password (HOTP) algorithmspecified inRFC 4226 and the Time-basedOne-time Password (TOTP) algorithm specifiedinRFC 6238.

Further documentation is available intheWiki.