Information processing system and method
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 18, 2008
Grant Date -
Oct 2, 2003
app pub date -
Dec 21, 2001
filing date -
Dec 26, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An information processing system and method are disclosed in which information processing is performed using an enabling key block (EKB) in association with a tree structure including category subtrees. A key tree is produced, which include subtrees that are grouped in accordance with categories and are managed by category entities. The EKB includes data produced by selecting a path in the key tree and encrypting a higher-level key in the selected path using a lower-level key in the selected path. The EKB is then provided to a device. A requester, which requests production of the EKB, may produce a root key or may request a key distribution center (KDC) to produce a root key. If the (KDC) produces the EKB, it may also request a category entity to produce a sub-EKB.
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