Storage Medium Processing Method, Storage Medium Processing Apparatus, and Program
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United States of America Patent
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N/A
Issued Date -
Sep 27, 2007
app pub date -
Jun 2, 2005
filing date -
Jun 28, 2004
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
User keys make sensitive management of users which are different per type of services. A SD card SDq may store plural kinds of service user keys Kus which are different per type of services. The service user key Kus is encrypted by a medium unique key Kmu and is stored in a protection area 3. The protection area 3 stores a master user key Kumst encrypted by the medium unique key Kmu, as well as the service user keys Kus. The master user key Kumst is a key used for encrypting the service user key Kus when obtaining a service user key Kus.
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