Abstract A secure credit card 10 has a body member to which is attached a microprocessor controller 14 electrically coupled a Programmable Read Only Memory (PROM) device 18 programmed with a series of random numbers in a predetermined sequence. The random numbers are identical to random numbers in a host computer and in the identical sequence as the random numbers in the host computer. This computer is accessible upon each use of the credit card 10. The Programmable Read Only Memory (PROM) accesses the next random number in sequence with each use of the credit card 10 to permit verification by comparing the random number with each use of the credit card 10 with the next random number in sequence as indicated by the computer. A switch 20 actuated with each use of the credit card 10 provides a pulse signal that activates the microprocessor controller 14 to turn on the Programmable Read Only Memory (PROM) to access the next random number in the sequence. A counter 26 connected to the microprocessor controller 14 counts the number of pulse signals received to count each use of the credit card 10. A display device 24 displays the next Personal Identification Number (PIN) in the sequence each time a pulse is received.
A secure credit card including a body member to which is attached to a microprocessor controller which is electrically coupled to a programmable read only memory device programmed with a series of random numbers in a predetermined sequence, said random numbers being identical to random numbers in a host control computer and in the identical sequence as the random numbers in the host computer, said host computer being accessible upon each use of the credit card, said programmable read only memory device accessing the next random number in sequence with each use of the credit card to permit verification by comparing the number provided by said programmable read only memory device with each use of the credit card with the next random number in sequence as indicated by the host computer, a switch actuated with each use of the credit card that provides a pulse signal that is forwarded to the microprocessor controller and activates the microprocessor controller to access the programmable read only memory device to provide the next random number in the sequence, a counter connected to the microprocessor controller which counts the number of pulse signals received to count each use of the credit card, and a display device in the body member connected electrically to the programmable read only memory device, said display device displaying the next random number in the sequence each time a pulse is received.
Claim 2
Dependent Claim
232 words
A secure credit card including a body member to which is attached to a microprocessor controller which is electrically coupled to a programmable read only memory device programmed with a series of random numbers in a predetermined sequence, said random numbers being identical to random numbers in a host control computer and in the identical sequence as the random numbers in the host computer, said host computer being accessible upon each use of the credit card, said programmable read only memory device accessing the next random number in sequence with each use of the credit card to permit verification by comparing the number provided by said programmable read only memory device with each use of the credit card with the next random number in sequence as indicated by the host computer, a switch actuated with each use of the credit card that provides a pulse signal that is forwarded to the microprocessor controller and activates the microprocessor controller to access the programmable read only memory device to provide the next random number in the sequence, a counter connected to the microprocessor controller which counts the number of pulse signals received to count each use of the credit card, and a display device in the body member connected electrically to the programmable read only memory device, said display device displaying the next random number in the sequence each time a pulse is received.