A number printed on the back of MasterCard credit cards. By making this number a requirement when collecting card holder information merchants can reduce the risk of fraud and charge backs.

A unique check value encoded on the magnetic stripe of a card to validate card information during the authorization process. The card verification value is calculated from the data encoded on the magnetic stripe using a secure cryptographic process. This method is used by MasterCard.

security number printed on the back of MasterCard credit cards. Requiring this number during checkout can reduce credit card fraud

Numeric security code is printed on the back of MasterCard credit cards. Requiring this number on order checkouts can reduce credit card fraud and charge back instances significantly when used in addition to AVS.

A unique value calculated from the data encoded on the magnetic stripe of a MasterCard card, validating card information during the authorization process.