Using a HackRF One PortaPack as a Mag Stripe Reader and Replayer

For that, he used a cheap off-the-shelf FM transmitter. That creates a radio station that the HackRF One can tune into to pick up and record the mag stripe tracks. If Mendoza were a bad person, he could just go around swiping people’s cards to collect recordings, but he obviously won’t do that. With a mag stripe recording on hand as a WAV file, he can then replay it with a simple magnetic coil connected to the HackRF One’s audio output jack. The coil just needs to be positioned near a credit card reader’s magnetic head, and Mendoza can “swipe” any credit card he has recorded.

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