"Since one time codes in Authenticator were only stored on a single ... set up two-factor authentication for a website is to scan a QR code with the app. A site that supports 2FA via an ...

In terms of data the apps collect, Mysk says Google’s Authenticator performs “very well” and doesn’t share details of QR codes with Google. “Most apps, including Microsoft Authenticator ...

An additional word of caution when it comes to QR codes: Codes used to enroll a site into two-factor authentication from Google Authenticator, Authy, or another authenticator app provide the ...