This article is for educational purposes only, ripping off a poorly created system is still theft. That being said we can learn lots about how not to create a card payment system. Koala from Because life is a hack was curious what made his laundry card payment system work, after cracking open the case he was surprised to see an EEPROM inside. Using a Bus Pirate and a Openbench Logic Sniffer logic analyzer the workings of the system were soon discovered. He can now easily put any value he wants on the card (for testing purposes of course).
Via: Hack a Day
