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NetTuts.com: Integrating Two-Factor Authentication with CodeIgniter

Note: This article was originally published at PHPDeveloper on 28 June 2011.
PHPDeveloper

On NetTuts.com today they have a new tutorial showing you how to use two-factor authentication in your CodeIgniter-based application - a login process combining a username/password and access to a device that's authorized for the account.

Two-factor authentication is a way of proving your identity based on your username and password as well as a physical device that you can carry with you. This makes it much harder for crooks to steal your identity, since they will need access to your phone or hardware token - not just your login credentials.

They've chosen the free service offered by Duo Security that lets you approve the device in several ways including a phone call, SMS tokens and push-based authentication. They walk you through the setup of a Duo account, making an "Integration", grabbing the PHP and Javascript files needed to make it work and changing up your user and administration module to send a bcrypted value to the service. They flesh it out with a new version of the view to include the Duo code and generating the signed request.