发明名称 |
Information recording/reproducing apparatus and method |
摘要 |
In a tree-structural key distribution system, renewed data of a master key and medium key are sent along with a key renewal block (KRB). KRB is such that each of devices included as leaves of a tree structure has a leaf key and restricted node key. A specific KRB can be generated for a group identified by a specific node and distributed to the group to restrict a device for which the key can be renewed. Any device not belonging to the group cannot decrypt the key, whereby the security of key distribution can be assured. Especially in a system using a generation-managed master key, a master key renewed with KRB can be distributed. <IMAGE> |
申请公布号 |
AU4684501(A) |
申请公布日期 |
2001.10.23 |
申请号 |
AU20010046845 |
申请日期 |
2001.04.05 |
申请人 |
SONY CORPORATION |
发明人 |
TOMOYUKI ASANO;YOSHITOMO OSAWA;RYUJI ISHIGURO;ATSUSHI MITSUZAWA;TATEO OISHI |
分类号 |
G06F12/14;G06F21/24;G11B20/00;G11B20/10;H04L9/08;H04N5/91;(IPC1-7):H04L9/00;G11B20/12 |
主分类号 |
G06F12/14 |
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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