Multi-factor authentication (MFA) is a method of confirming a user's identity in which a user is granted access only after successfully presenting 2 or more pieces of evidence (or factors) to an authentication mechanism:
- Something they know (e.g. password),
- Something they have, or
- Something they are
A very common step in Multi-factor authentication is a 6 digit number generated by an app that is common to the user and the authentication system.
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