I designed a breadboard for use with the project over at http://demoseen.com/bhpaper.html
Basically he found out that those Onity door systems used pretty much anywhere you are given a keycard to enter the room (hotels) are completely insecure and can be opened by simply reading a code from the charger port and playing it back. There's more technical details at the link above.
All I did here was design a circuit board around it.