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Here you can download the firmware for the Proxmark III with ISO14443-A support. It is an extension on the software that is available on the website of Jonathan Westhues. The FPGA contains an extra module called hi_iso14443a.v which is responsible for the Digital Signal Processing. The firmware for the ARM is extended with iso14443a.c which contains the decoding and encoding routines.
The Windows client has also been modified to allow four more commands:
The client application of the Omnikey 5121 reader thinks it is talking with a Mifare Classic 4K card. We know it is not ;-)
After hi14areader and hi14alist you can see the repeating answers of the anticollission phase. The changing four byte answer after each anticollision is the random generated by the card as a challenge for the reader (The reader messages are not displayed).
After hi14asnoop and hi14alist you can see the sniffed communication between a reader and a Mifare Classic card. You can clearly see that the reader keeps polling if the card is still there.