Moodle Plugins directory: Multi-factor authentication: Stats | Moodle.org
Multi-factor authentication
Administration tools ::: tool_mfa
Maintained by 
Catalyst IT, 
Brendan Heywood, 
Peter Burnett, 
Mikhail Golenkov
Brendan Heywood, Peter Burnett, This is a Moodle plugin which adds Multi-Factor authentication (MFA), also known as Two-factor authentication (2FA) on top of your existing chosen authentication plugins.
https://en.wikipedia.org/wiki/Multi-factor_authentication