发明名称 |
Encryption apparatus, decryption apparatus, expanded key generating apparatus and method therefor, and recording medium |
摘要 |
Expanded key schedule circuit for common key encryption system in which expanded keys are used in a predetermined order in data randomizing process for encryption and in a reversed order in data randomizing process for decryption, comprises round processing circuits connected in series. The round processing circuits subject the common key or sub key of a previous stage to a round function to output a sub key. The sub key of the last stage is equal to the common key. The expanded keys are generated from the sub keys.
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申请公布号 |
US7194090(B2) |
申请公布日期 |
2007.03.20 |
申请号 |
US20010902696 |
申请日期 |
2001.07.12 |
申请人 |
KABUSHIKI KAISHA TOSHIBA |
发明人 |
MURATANI HIROFUMI;MOTOYAMA MASAHIKO;OHKUMA KENJI;SANO FUMIHIKO;KAWAMURA SHINICHI |
分类号 |
G09C1/00;H04K1/00;H04L9/00;H04L9/06 |
主分类号 |
G09C1/00 |
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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