Ken's Project Blog

January 23, 2011

Decoding Credit Card Numbers

Filed under: Personal — Ken @ 9:32 am

OK, this has nothing to do with anything other than being interesting to me, so I posted it here more as a holding place for this info. While I personally don’t need to verify credit card numbers, I think it’s interesting to see how they included a confirmation mechanism in the numbers themselves so that without a resource-intensive database lookup a retailer can reject invalid number…



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