IC card and method of checking personal identification number of

Details IC card and method of checking personal identification number of IC card and method of checking personal identification number of

1993-08-19

1994-11-22

Shepperd, John

Registers

Systems controlled by data bearing records

Credit or identification card systems

235492, 902 5, G06F 1530

Patent

active

053671490

ABSTRACT:
An IC card according to the present invention includes data processing means for processing data; a memory for storing a personal identification number; a power-supply terminal to which a power-supply voltage is applied by an external unit; an input/output terminal for inputting data from and outputting data to the external unit; a voltage detecting circuit for detecting the power-supply voltage applied to the power-supply terminal from the external unit; and a check-processing circuit for verifying a personal identification number input from the external unit by comparison with a personal identification number stored in the memory in response to a command for verifying applied to the input/output terminal when the power-supply voltage detected in the voltage detecting circuit is at least equal to a threshold voltage and constantly responding that an identification error has occurred when the power-supply voltage detected in the voltage detecting circuit is lower than the threshold voltage.

REFERENCES:
patent: 4439670 (1984-03-01), Basset et al.
patent: 4839506 (1989-06-01), Homms et al.
patent: 4990760 (1991-02-01), Tomari et al.
patent: 5034597 (1991-07-01), Atsumi et al.
patent: 5157247 (1992-10-01), Takahira

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