发明名称 |
Information recording apparatus having function of encrypting information |
摘要 |
First information is divided into equal-size information pieces. Serial numbers are assigned to the information pieces, respectively. An encryption key is generated from a base number and a variable number varying for each of the information pieces. The base number is common to an information range managed by one licence. The first information is encrypted on a block-by-block basis in response to the encryption key to get encryption-resultant information for every predetermined minimum information unit smaller than the sizes of the information pieces. The encryption-resultant information is recorded on a recording medium. A determination is made as to logical addresses of heads of portions of the recording medium which are loaded with portions of the encryption-resultant information corresponding to the respective information pieces. Second information representing a correspondence relation between the determined logical addresses and the assigned serial numbers is recorded on the recording medium.
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申请公布号 |
US2003065925(A1) |
申请公布日期 |
2003.04.03 |
申请号 |
US20020196152 |
申请日期 |
2002.07.17 |
申请人 |
SHINDO TOMOYUKI;OHISHI TAKEO |
发明人 |
SHINDO TOMOYUKI;OHISHI TAKEO |
分类号 |
G06F12/14;G06F21/00;G06F21/24;G11B20/00;G11B20/10;H04L9/06;H04L9/16;H04N5/76;H04N5/781;H04N5/91;H04N5/913;H04N9/804;(IPC1-7):H04K1/00 |
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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