I purchased an MFRC522 RFID reader and have it working pretty well, but I have a question about the authentication keys. I'm using the MIFARE Classic 1K card (I'm pretty sure). It claims to have two authentication keys in the 4th block of each sector. From the MFRC522.h file... MIFARE Classic 1K …

MFRC522 RFID reader authentication keys

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