Hi folks!

I've been working on an idea to provide an inexpensive 2 factor authentication system to websites.

Websites can hook into the APIs to easily provide a card based second layer of authentication.

The APIs and more info can be found here: https://go2fac.appspot.com

It's easier to show how it works than to explain it, so I made an open source PHP/MySQL login system that uses the APIs.  That site can be found here: http://174.5.169.52/go2fac

Since I wrote it all by hand, there might still be some bugs and things are still a little rough around the edges, but you can get a good idea what it's all about.

I know there are a lot of skilled programmers around here and I'm looking for your input to improve the API services and the security of the sample PHP code. 

Maybe the whole idea of using a card based authentication is crap...idk.  But I'm interested to hear your thoughts.

Thanks guys!

Steve