Cryptography – Key management – Having particular key generator
Reexamination Certificate
2011-08-16
2011-08-16
Vu, Kimyen (Department: 2435)
Cryptography
Key management
Having particular key generator
C380S040000
Reexamination Certificate
active
08000472
ABSTRACT:
The present invention stores and manages only one piece of key information even if contents information includes a plurality of partial contents arranged in a sequence, and the partial contents are encrypted with different keys. When a piece of contents information includes four partial contents or divided into four partial contents, a key for each of four node positions is generated through four steps of operations from a key for the top root. Node keys P (i, 1) and P (i, i) at both sides are generated by a one-way function from node keys P (i−1, 1) and P (i−1, i−1) at the upper i−1thlayer, and a node key P (i, m) (m=2, 3, . . . , i−1) are generated by a one-way function which can generate the keys from any of node keys P (i−1, m−1) and P (i−1, m) at the upper i−1thlayer, where jthnode key at the ithlayer is represented as P (i, j) (j=1, 2, . . . , i−1). Then, each of partial contents is encrypted with key information generated at a terminal layer. If only a root key is saved, one encrypting key can be generated for a range of partial contents arranged in a sequence.
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Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Shirazi Sayed Beheshti
Vu Kimyen
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