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Q. Is the CVV2 number related to the actual credit card number? Is it a random number? Or is there some other way that the card issuer selects the CVV2 number to put on a card?
A. I don't think MC or Visa require a particular algorithm, so it can be a random number stored in a secure lookup table, or it can be a derived number based on card data using a secret issuer key.
== Security model ==
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