Secret information preserving system for a multiple issuer IC card
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United States of America Patent
Stats
-
May 22, 1990
Grant Date -
N/A
app pub date -
Mar 17, 1988
filing date -
Mar 20, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system for maintaining the secrecy of information stored in a multiple issuer IC card, comprising an IC card which has its memory divided into a plurality of discrete portions, each of which may be accessed only by means of a predetermined different identification code, and a terminal which is used to write an identification code into a portion of the card memory only when it is supplied with an input code which corresponds with an issuer code which was previously stored in that portion of the memory.
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