US Patent 9183480 Using temporary data with a magnetic stripe card

A method and apparatus are disclosed for using temporary data with a magnetic stripe card to reduce incidents of fraudulent card transactions. A first set of temporary data, valid until an occurrence of an event, is generated and applied to a magnetic stripe area of a magnetic stripe card (“the card”). The card can be used for a first transaction, which is authorized based on a verification that the first set of temporary data is valid, or was valid and is not expired. The transaction is processed based on an account associated with the card. The event occurs, rendering the first data item invalid, and a second set of temporary data is generated and applied to the magnetic stripe area.