Two-factor authentication can be used to add an extra layer of security to a Webmin account, as well as the regular username and password. When enabled, a user will need to provide an extra authentication token which typically comes from a smartphone app, hardware OTP generator or SMS.

This page allows you to select an authentication provider for Webmin users on your system. Once enabled, each user can then enroll for two-factor in the Webmin Users module. The available two-factor providers are :

Authy
  This is a commercial service that provides a smartphone app and website for managing two-factor users. Each user must create an account on Authy's website and link it to their smartphone.

Google Authenticator
  This is a smartphone app that implements the standard TOTP protocol. Each user must scan a QR code using the app to link their tokens with the Webmin server.