Information processing system and method

Details Information processing system and method Information processing system and method

2008-03-18

2008-03-18

Revak, Christopher (Department: 2131)

Cryptography

Key management

Key distribution

C713S177000, C705S051000

Reexamination Certificate

active

07346170

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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