http://tutacomm6oqwlbbpd246mljjxpupuxxqj2jg5mfdyegeaetdauigslad.onion/blog/2fa-two-factor-authentication-totp-u2f
Authenticator app: TOTP (supported) an app generates codes that are only valid for a short period of time (Google Authenticator, Authy, etc.) manual entry required upon every login requires no hardware device does not protect the mobile device login because app on mobile device generates second factor Authenticator app: HOTP an app generates codes that are valid forever (Google Authenticator, Authy, etc.) codes need to be stored securely manual entry required upon every login requires no hardware device...