File managing method requiring a change in key data and IC card device using the method
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United States of America Patent
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Jul 27, 1999
Grant Date -
N/A
app pub date -
Mar 28, 1997
filing date -
Mar 29, 1996
priority date (Note) -
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Abstract
A file managing method includes a step of setting a key data of a portable storage medium having a plurality of storage areas, a step of determining whether the key data is changed, a step of inhibiting data from being processed in the plurality of storage areas when it is determined that the key data is not changed, and a step of processing data of the plurality of storage areas in response to a given command when it is determined that the key data is changed.
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