Memory device, memory access limiting system, and memory access method
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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N/A
Issued Date -
Sep 30, 2004
app pub date -
Mar 24, 2004
filing date -
Mar 31, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An IC card is provided with a nonvolatile data area in which data can be read and written, a nonvolatile key data area into which data can be written but cannot be read, and a nonvolatile key register into which data can be written but cannot be read. Writing predetermined data, which are not encrypted but need to be kept secret, into the data area and key data into the key data area, inhibits reading and writing data in the data area. Reading or writing in the data area is authorized only if proper key data are written into the key register, and inhibited if improper key data are written into the key register.
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