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I recently got a similar message, "Your Google verification code is" and then an unusually long verification code (much more than the normal six characters you get through 2 factor authentication). An hour or so before, I had used the Hangouts app and tried to verify my phone number. The first attempt failed, and for unrelated reasons I restarted the phone ...


2

Google now supports 2-Factor Authentication through a process called U2F. Yubico have made a series of Yubikeys that now support the U2F standard. https://www.yubico.com/applications/fido/ At this time the only browser capable of supporting U2F authentication appears to be Google Chrome.



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