After recording an audio file of him sliding his card though the Square reader, looked at the number of times the waveform flipped from positive to negative. With a small shim, it’s possible to re-align the head to get the data from track one. The magnetic head in the Square card reader is positioned to only read track two. The only components in the Square card reader are a head from a tape player and a 1/8″ microphone jack. ![]() Track two only contains the credit card number and expiration date. Track three is mostly unused, whereas track one contains the card holder name, account number, cvc code and other ancillary data. Basically, each credit card has two or three tracks. ’s work in decoding credit card data builds off ’s article from the bbs days. With simplicity comes an ease in understanding, and was able to successfully read his own credit card with this tiny and free credit card reader. This bit of hardware is a little unimpressive unsurprising because Square is giving them away. got a hold of one of these tiny peripherals and did what any sane person would do: tear it apart and learn how it works. A company called Square is giving out free credit card readers that turn any iPhone or iPad into a Point of Sale terminal.
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