Method and software for comparing a PIN number for a service card fitted with a variable display, a new value based on a random number is generated each time the card is used, this new value serves for the next card user

摘要

The method (a) determine and receive an initial value of code generation on the card;use this value and a code generating algorithm to generate a valid code for the variable access code;authorize card use on a terminal if the valid code has been entered as access code;modify and receive a new code value each time that the code is used on a terminal. This new value is used to generate the a valid code for variable code access the next time that the card is used An additional stage displays the code generation value on the card or displays a partial value of the code on the card terminal, which may be a card reader. The code generation is a random number and the value of the valid code is generated by applying the code generating algorithm with the generated random number. The software includes program code instructions recorded on a support used in a computer memory support such as a floppy disk.