Apart from entering a card number and an expiration date, you probably will have to enter a security code — a feature on every credit card meant to help verify the card is in your possession.

Credit card numbers are used to identify the card network, the card issuer and the cardholder. Other numbers on a card include a security code, expiration date and a customer service phone number.

Here's how it works: When you're ready to make a purchase, MaskMe will randomly generate a masked card - a one-time-use credit card number, expiration date and security code with a name of your ...