Hi Qubes fellows,On reading content on 2FA, something comfuse me, so I'd like 
to understand better by posting here:one type of OTP,a TOTP like google 
authenticator, bases on a shared secret key, since keycan be seen in mail box, 
it's not quite safe, is it saved in mail box as well?(does it also travel on 
internet? which makes it even worse?) a U2F software can do it's work without 
this app, so it doesn't look like a good choice.If this is the case, why so 
many web mail even some promising ones still chose google-authenticator as 
2FA?Although gmail itself can add yubikey as enhence for TOTP, I don't see how 
that's safer.because with or without press the yubikey button, an U2F software 
can generate same 6-digit-number as password to enter here. Today most of 
webmails would say they use 2FA, but not introduce in detailswhich protocol it 
uses. some claim it use yubikey, so is OTP here that use key pair instead of 
the shared secret key? which is much better.I don't find many webmail use Y
 ubikey as 2FA on OTP,if any of you find something is rather relaible,recommend 
very welcome, THANK YOU.


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