Portable electronic apparatus having key data for limiting memor

Details Portable electronic apparatus having key data for limiting memor Portable electronic apparatus having key data for limiting memor

1989-08-23

1991-01-15

Pitts, Harold

Registers

Records

Conductive

235380, 235487, G06K 1906

Patent

active

049856154

ABSTRACT:
An IC card has a first type of key data used for an access enable/disable judgement for a common data file and all of the application data files, and a second type of key data used for an access enable/disable judgment for a specific application data file and the common data file. A storage section for storing key data registered for the common data file and a storage section for storing a collation result of key data registered for the application data files are separately arranged. Upon selection of an application data file, when an application data file different from the currently selected application data file is selected, the latter collation result is set in a non-collation status. Therefore, key data is effective only when a corresponding application is selected.

REFERENCES:
patent: 4734568 (1988-03-01), Watanabe

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