Thanks, I see Duo are using the Yubikey U2F devices I've referenced in this thread: https://www.wilderssecurity.com/thre...authentication-key-released-by-yubico.369367/ It's great news that Google is supporting this for 2FA, as it's the only 2FA standard that even remotely seems to respect your privacy, you mint a new secret for each site which is stored on the key (or proxied). I'll likely get a couple and report back on it, my understanding is that Chrome is the only browser supporting U2F right now. Paypal and Mastercard are also in the Fido Alliance. I suppose though, unless MS and Apple also join in, this will only be yet another language of authentication babel.