Developed during Box's January 2013 hackathon by Ian Atha.

Blauth
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A Bluetooth-enabled fork of Google Authenticator for iOS, along with a Mac OS client.


Caveats
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* Relies on Bluetooth Pairing for a all-or-nothing authorization.
* Doesn't support multiple One-Time-Password accounts (always fetches the first).
* Ill-defined Bluetooth Protocol.