How they hacked it: The MiFare RFID crack explained
March 20th, 2008 by David EvansThis article in Computer World provides an excellent detailed description of how the Mifare reverse-engineering was done:
How they hacked it: The MiFare RFID crack explained, by Geetal Dayal, ComputerWorld, 19 March 2008. (It follows an earlier ComputerWorld article.)