IC card
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United States of America Patent
Stats
-
Oct 27, 1992
Grant Date -
N/A
app pub date -
Jul 31, 1989
filing date -
Feb 17, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An intrinsic cipher code peculiar to each IC card is written and stored in EEPROM serving as a writable non-volatile memory in an IC card, as well as a routine for performing collation with the intrinsic cipher code before a test program is executed being stored in a read-only memory as to allow access to the test program when agreement is established. An attempt can thus be made to improve security for access to the test program.
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