Enhanced security of chip cards and magnetic cards associated with financial transactions

摘要

The method involves interrogating a secret personal code, esp. a multiple element code, to validate the card user. After correct entry of the secret personal code the card is used. On the card being used for the next transaction, a second, different code is interrogated. The secret codes are alternately activated on the card. Alternatively, two or more secret codes are stored on the card and are activated at random.