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Re:Authy (YC W12) launches two-factor auth as a service by semenko on Thursday August 02, 2012 @02:36PM (#4330239)
I wouldn't be surprised if Google has tried this.

Remember their short-lived QR code-based logon system?

http://www.theverge.com/2012/1/17/2714263/google-experiment-...

http://www.zdnet.com/blog/igeneration/googles-qr-code-log-in...

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