How is this different from the phone based 2-factor that Google once had for their own products? Honest question, not being sarcastic here.
Google used to have an authentication system that would display a QR code on the screen which you would use your phone to navigate to. That URL would then, assuming your phone was already authenticated to Google, log you in on the computer as well. I was trying to remember the name of the system, but can't come up with it.
The short version is that Google determined the system to be too insecure and vulnerable to exploit and canceled the system.
Google used to have an authentication system that would display a QR code on the screen which you would use your phone to navigate to. That URL would then, assuming your phone was already authenticated to Google, log you in on the computer as well. I was trying to remember the name of the system, but can't come up with it.
The short version is that Google determined the system to be too insecure and vulnerable to exploit and canceled the system.