发明名称 |
KEY GENERATION DEVICE, ENCRYPTION DEVICE, RECEPTION DEVICE, KEY GENERATION METHOD, ENCRYPTION METHOD, KEY PROCESSING METHOD, AND PROGRAM |
摘要 |
<p>A key generation device according to the present invention hierarchically constructs a Y-ary tree structure where n reception devices are assigned to leaves, and forms subgroups where individual intermediate nodes existing between the leaves and a root of the Y-ary tree structure are defined as parent nodes. By providing new parameters to the individual intermediate parameters, the subgroups can be formed flexibly. In a case where no excluded customer exists or the number of excluded customers is small, the size of a header to be delivered and the calculation amount of an operation that a customer needs to perform can be reduced.</p> |
申请公布号 |
EP2068489(A1) |
申请公布日期 |
2009.06.10 |
申请号 |
EP20070792625 |
申请日期 |
2007.08.17 |
申请人 |
SONY CORPORATION |
发明人 |
KUSAKAWA, MASAFUMI;ASANO, TOMOYUKI |
分类号 |
H04L9/08 |
主分类号 |
H04L9/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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