原文：http://www.backtrack-linux.org/wiki/index.php/RFID_Cooking_with_Mifare_Classic
root@bt:~# nfc-mfclassic --help
Usage: nfc-mfclassic r|w a|b <dump.mfd> [<keys.mfd>]
r|w - Perform read from (r) or write to (w) card
a|b - Use A or B keys for action
<dump.mfd> - MiFare Dump (MFD) used to write (card to MFD) or (MFD to card)
<keys.mfd> - MiFare Dump (MFD) that contain the keys (optional)
Or: nfc-mfclassic x <dump.mfd> <payload.bin>
x - Extract payload (data blocks) from MFD
<dump.mfd> - MiFare Dump (MFD) that contains wanted payload
<payload.bin> - Binary file where payload will be extracted
