#Two Factor Authentication with Drywall and Twilio
Two factor authentication is where you check that the user both knows something (e.g. a password) and has something (e.g. a cellphone). One way to do the latter is to send the user an SMS message.
If you have a site with users, there are a number of possible ways you could add two factor authentication.
- Password + SMS code at signup
- Password + SMS code at login
- In a normal session, popup SMS code verification request