Magnetic Swipe Cards are used everywhere, probably the most common one that we all have in our wallets is the one that is built into our bank and credit cards. Craig from the Flashing LEDs blog was had a reader that was sitting around with no purpose. He swiped his University ID through it and found that the only thing on track 2 was university ID number, this card system is used for lots of systems around the university. He built a system that was able to simulate the card being swiped. Turns out there might be more to the card than what is living on track 2 since it was not able to fool the card system but I am betting if all of the tracks were analyzed the security that the card provides might come crashing down.
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