Security · Website glossary

Multi-factor authentication

Quick answer · What is Multi-factor authentication?

Authentication requiring evidence from more than one category of factor, such as something known and something possessed.

IN PRACTICE

Multi-factor authentication: an example

An account combines a password with a supported authenticator or security key.

KEEP IN MIND

Two passwords are still one factor category; recovery methods also need appropriate protection.

Put the idea to work

Frequently asked questions

What is a practical example of Multi-factor authentication?

An account combines a password with a supported authenticator or security key.

Do two passwords count as two authentication factors?

Two passwords are still one factor category; recovery methods also need appropriate protection.

Which concepts should I read alongside Multi-factor authentication?

Authentication: The process of checking that a person or system is who or what it claims to be.
Recovery code: A pre-issued secret that can restore account access when a normal authentication method is unavailable.