Credit cards
Here’s the algorithm for checksumming a credit card number, plus information on what all the fields are.
But you can checksum the numbers all you like, if the signature doesn’t match the transaction never happened.
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August 2006 M T W T F S S « Jul Sep » 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 - Feeds and other:
August 2nd, 2006 at 10:24
I love that prank. Amazing how much you can get away with. I heard recently that they’re planning to replace the signature with a PIN. Probably better security.