To add a TOTP device later view the screenshot and scan the QR code. When the site gives you the QR code, take a screenshot and save that in some secure fashion. If you don't have all your devices available at the same time, or you want to allow for the possibility of adding a new device later, you can simply save the QR code. That way I'm covered if one of the apps stops being supported). (Actually, I scan it twice on each device, using two different TOTP apps. The simplest case, applicable if you have access to more than one device that supports generating TOTP codes at the time you are setting up TOTP for a given site, is to simply scan the site's QR code on all the devices.Į.g., when I create an account at a site that uses TOTP I scan the QR code on both my phone and my tablet. Yeah, bridging convenience and security is a long standing nightmare of a problem to solve. That also means that you should not have your password manager on the phone, or at least only have a separate one: ideally, password managers would integrate between desktops and mobile devices to pass short-lived access to passwords for Oauth/OpenID Connect auth instead. Physical separation of the two authentication factors, thus, matters. Making it not a "second" anything: it's akin to using two passwords for log in to a single site and keeping them in the same place. You are still protected from your password hash being stolen from the target website, decrypted and then used for log-in, but if password hashes were accessed, potentially a bunch of other stuff that you'd care about is too, so that's a somewhat moot point.īut someone stealing your laptop and getting access to your password manager gets access to your 2FA too. If your password manager has control of both your password and your "2nd" factor auth, it defeats the purpose of it being a 2nd factor.
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