MIFARE Classic offline cracker

 MFOC is an open source implementation of "offline nested" attack by Nethemba.
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 This program allow one to recover authentication keys from MIFARE Classic card.
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 Please note that MFOC is able to recover keys from target only if it have
 a known key: default one (hardcoded in MFOC) or custom one (user provided
 using command line).