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Wednesday, July 7, 2010
The Credit Card "Da Vinci Code"
From MSN Money. A pre-computer security feature was slipped into your credit card numbers and remains there today. Pull out a card and a pencil to see the math trick for yourself.
"...the code, which can reveal whether a credit card number is fraudulent, is cryptically hidden within the sequence of the card numbers. Every legitimate credit, debit and ATM card on Earth contains this formula."
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