A demo that registers users and lets them set up Google Authenticator (TOTP) and Fido U2F tokens as 2FA
This uses an app on your phone (Android &iPhone) to generate one time passwords based on the current time.
The application can generate codes for multiple different site at a time and can easily be configured by scanning a QR code or typing in a short sequence of characters.
This mechanism is used by organisations such as Google, Dropbox and Github
This method uses a USB token that holds a certificate to generate a signed token on request. At the moment this only works in Chrome, but there is work to create a plugin for Firefox (install and github)
There are a number of different manufacturers making U2F tokens.
U2F is supported by Google,Dropbox and Github
Register new user by clicking here or login here