Method and apparatus for determining the validity of data in an integrated circuit card
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United States of America Patent
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-
Sep 7, 1993
Grant Date -
N/A
app pub date -
Apr 6, 1989
filing date -
Apr 8, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved IC card to be inserted in a data processing unit, for communicating data therewith includes: a memory for storing data having a validity term to be transferred to the data processing unit; a timer for determining whether specified time is within the term or not; and a data validity determining unit which does not transfer the data to the data processing unit when the data is not within the validity term. The memory stores not only the data having the term but also its validity term. Accordingly, data for control of the validity term of the data does not need to be prepared outside the IC card.
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