Title:
【発明の名称】ICカード及びICカードの暗証番号照合方法
Document Type and Number:
Japanese Patent JP2746801
Kind Code:
B2
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.
Inventors:
TAKAHIRA KENICHI
Application Number:
JP25041892A
Publication Date:
May 06, 1998
Filing Date:
August 27, 1992
Export Citation:
Assignee:
MITSUBISHI DENKI KK
International Classes:
G06K17/00; G06F12/14; G06K19/073; G06K19/10; G07D9/00; G07F7/10; (IPC1-7): G06K19/10; G06K17/00; G06K19/073; G07D9/00
Domestic Patent References:
| JP60218187A | ||||
| JP61182188A |
Attorney, Agent or Firm:
Hiroaki Tazawa (2 outside)