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Problem with MIFARE ULTRALIGHT C 3DES Authentication

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Mexx0085

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Hi guys!
I have a problem... Working with a MIFARE 523 Reader and want to perform an 3DES authentication on a Ultralight C card.

My documentation says that there are two steps needed.

The first one is to send 0x1A 00 to the card.
Then the card answers with a specific token ek(RndB)

The next step is to send 0xAF and the randomly generated ek(RndA + RndB').

My question is: how do i get the token ek(RndA + RndB') which i need to send with the AF command?

I hope u can help me

with kind regards

Mexx
 

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