Portable electronic apparatus having key data for limiting memory access
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United States of America Patent
Stats
-
Jan 15, 1991
Grant Date -
N/A
app pub date -
Aug 23, 1989
filing date -
Aug 26, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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