FIELD: system of microprocessor cards; electronic purse.
SUBSTANCE: system contains a double chip card, which contains a fixed microcircuit, which serves the microprocessor and a second detachable microcircuit, which contains read-only storage, which contains a predetermined sum of credit, and a micro pack, which is meant for putting the card into and which has a capability of communicating with the external terminal. Apart from the predetermined sum of credit the read-only storage of the detachable microcircuit has a unique serial number appropriated by the central bank and during this, the sum of credit and the unique serial number are put into programmed memory when the card is put into the micro pack for the first time.
EFFECT: invention allows the creation of a system with a microprocessor card, containing a fixed module and a detachable module, and the sum of credit cannot be changed, additionally, it is under control of the central bank.
13 cl, 6 dwg
