The MasterCard brand name for their service that uses the 3D-secure standard.
What is MasterCard® SecureCode?
MasterCard SecureCode is a new service that enhances your existing MasterCard card. A private code gives added protection against unauthorized use of your card when you shop at participating online merchants.
Once you've registered and created your own private SecureCode, you will be automatically prompted by your card issuer to type in your SecureCode each time you make a purchase at participating online stores/retailers. Then your SecureCode will be quickly confirmed by your card issuer to complete your purchase. Your SecureCode will never be shared with the store/retailer and using it is as easy as entering your PIN at an ATM.
Correctly entering your SecureCode during a purchase at a participating online store/retailer, confirms that you are the authorized cardholder. If an incorrect SecureCode is entered, the purchase will not be completed. Even if someone knows your credit or debit card number, the purchase cannot be completed without your SecureCode at a participating store/retailer.