A message authentication code (MAC), or tag, is a security code that is typed in by the user of a computer to access accounts or portals. This code is attached to the message or request sent by ...

With the email authentication option, you’ll receive an email with a security code every time you log in to your account; the authenticator app makes use of common apps for this purpose listed ...

Two-factor authenticator apps are an alternative to authentication codes sent via text. Just as an online service provider might send a code to your mobile phone via SMS message to verify your ...