F3 Card data: PAN, Luhn, tracks and service code

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Lesson F3: What is on a card and how to read it: the PAN and its check digit, track data, the service code, masking.

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The opening of the lesson

Before any cryptography, a terminal reads data from the card and has to judge it:

The answers come from the PAN, the expiry date and the service code.

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