Wednesday, November 19, 2008

Card Verification Code 2 (CVC2)

Card Verification Code 2 (CVC2) is the three-digit number that is printed on the signature panel on the back of a MasterCard payment card, after the full account number or the last four digits of the account number. The number is generated when the card is issued, by hashing the card number and expiration date under a key known only to the card issuer. The CVC2 is used in card-not-present transactions to ensure that the card is valid. Card-not-present merchants ask the customer for the CVC2 and submit it as part of their authorization request. Merchants are prohibited from storing CVC2 information.

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