Information encryption apparatus and controlling method of the same, computer program and computer readable storage medium
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United States of America Patent
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Aug 16, 2011
Grant Date -
Jun 26, 2008
app pub date -
Dec 21, 2006
filing date -
Sep 1, 2004
priority date (Note) -
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Abstract
layer 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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