Abstract: A credit card has either a display screen capable of showing either a fully generated transactional credit card number or a partially generated number. In use, a user generates a dynamic “transactional” credit card number associated with his underlying account credit card number. To complete a secure transaction that cannot be copied and used at a later date, the credit card does not display the base credit card number, but instead uses on-card encryption to generate and/or display a transactional cc number that may be may include a portion of the base number or only digits that are generated into the transactional credit card number. The transactional cc number and not the base credit card number are provided to a vendor to complete a transaction. The credit card processing server uses decryption or a reverse lookup table to convert the transactional cc number back to the base cc number.