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Google does that without needing a QR code if you have a recent Android and haven't enabled 2FA

• nicky0 7y ago
  How does the communication from the computer to the phone work?
  • iudqnolq 7y ago
    No idea. Presumably a push notification. Within less than a second providing your email (on fast US data) you get a prompt on your phone that shows the browser model and approx location and asks you to approve or disapprove the login. They initially rolled it out as a 2FA option, then as an optional for 1FA.
    • nicky0 7y ago
      OK so you have to actually type your email into the computer.
      • iudqnolq 7y ago
        Exactly. Google already asked for email alone and then password on the next page so that they could support sending enterprise emails to custom login systems.