Forum Thread: How to Reveal MasterCard CVV2

I figured out how the Luhn Algorithm works for verifying the card check number and that the card is valid but I still haven't came across how your supposed to come up with the actual 3 or 4 digit code on the back of the card. I've been trying and just don't understand how any of the different methods and calculators haven't shown a way to do this. Any pointers would be helpful with showing me what part of the process I'm missing.