发明名称 |
KEY PROVIDING SYSTEM, KEY PROVIDING APPARATUS, TERMINAL APPARATUS, KEY PROVIDING METHOD, AND KEY GENERATING METHOD |
摘要 |
<p>A key providing apparatus for providing a key used for encryption or decryption of data to a predetermined terminal device is provided. The key providing apparatus includes an acquiring unit for acquiring a digraph formed by arranging at least one directional branch connecting the coordinate points on a coordinate axis having a plurality of coordinate points each corresponded with a subset representing a combination of a plurality of terminal devices, an extracting unit for extracting information of all the directional branches contained in the directional path connecting a starting point of the digraph and a predetermined coordinate point, and a key generation unit for generating a key corresponded to a subset to which a predetermined terminal deice belongs based on the digraph, where the information of the directional branch is provided to the predetermined terminal device.</p> |
申请公布号 |
EP2139153(A1) |
申请公布日期 |
2009.12.30 |
申请号 |
EP20080704422 |
申请日期 |
2008.02.04 |
申请人 |
SONY CORPORATION |
发明人 |
ASANO, TOMOYUKI;KUSAKAWA, MASAFUMI |
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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