-
-
Notifications
You must be signed in to change notification settings - Fork 1.8k
FAQ 2FA Types
Michael Loßin edited this page Sep 5, 2021
·
7 revisions
Here are all the 2FA types with a small description of every one of them.
Please keep in mind that many methods of 2FA can fit into multiple types.
This includes U2F keys, often something like a security token such as a Yubikey.
Hardware based authentication would include the following:
- Yubikeys - Non-U2F Yubikeys
- TAN generators - Usually in combination with a bank card.
- Paper OTP cards
- Other physical OTP devices
This means time-based one-time passwords (according to RFC-6238), often indicated by support for Google Authenticator.
Software based authentication other than totp would include the following:
- Authenticator apps like Authy or Zoho OneAuth that use their own protocol.
- Smartphone apps that offer verification by confirming a popup prompt.
Electronic mail based authentication.
SMS Text Message based authentication.
Phone call based authentication, e.g. by reading a one-time password or by responding via the phone keypad.
2fa.directory is made by 2factorauth and love from some awesome Contributors ❤️