Cryptography – Key management – Key distribution
Reexamination Certificate
2008-04-08
2008-04-08
Vu, Kim (Department: 2135)
Cryptography
Key management
Key distribution
C380S043000, C380S045000, C382S232000
Reexamination Certificate
active
10686577
ABSTRACT:
Image data encoded in units of a tile is processed to define a hierarchical structure by repeatedly forming one tile group from adjacent tiles and another tile group from adjacent tile groups. Plural partially encoded data a tile located at a terminal of the hierarchical structure are arranged in ascending order of priority of decryption to define a tree having as nodes tile groups, tiles, and partially encoded data. Encryption key information is generated for a node located at an uppermost layer of the tree and, up to a node located at a terminal, encryption key information is generated for a node of interest based on encryption key information for a node at an upper layer. When a node of partially encoded data is designated as an object to be encrypted, partially encoded data at a higher layer containing the designated object is set as an object to be encrypted.
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Moran Randal D
Vu Kim
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