Step-by-Step: How to Copy RFID and NFC Access Cards &
2018-5-23u2002·u2002At the time, RFID technology had spread like wildfire across many sectors — tech companies, hospitals, and more were using 125khz cards to access door secured with electric locks. Most were using the EM4100 protocol card (a type of 125khz card) or a CMOS IC-based card, which had the information about the tag or fob stored openly.
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