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公开(公告)号:US08634553B2
公开(公告)日:2014-01-21
申请号:US13283877
申请日:2011-10-28
申请人: Yoichi Hata , Toshiaki Kakii , Yasuhito Fujita , Yoshimitsu Goto , Hitoshi Kiya , Kiyoshi Nishikawa , Masaaki Fujiyoshi , Shoko Imaizumi
发明人: Yoichi Hata , Toshiaki Kakii , Yasuhito Fujita , Yoshimitsu Goto , Hitoshi Kiya , Kiyoshi Nishikawa , Masaaki Fujiyoshi , Shoko Imaizumi
IPC分类号: H04K1/00
CPC分类号: H04L9/0836 , H04L9/085 , H04L2209/38
摘要: A master key (K2,2) inputted by an input unit is stored in a storage unit. A matrix generating unit generates key element matrices (M1-M3) with respect to each of split keys (eR2, eR1, eR3) obtained by a key dividing unit dividing the master key (K2,2). To each coordinate entry of the key element matrices (M1-M3), operation data that successively obtained by repeating a hash operation with a one-way hash function is assigned, so as to maintain hierarchical nature of scalability (L). A key generating unit generates partial keys (K1,1-K2,2) corresponding to respective hierarchies of the scalabilities (R, L), on the basis of the key element matrices (M1-M3). These partial keys (K1,1-K2,2) are outputted to a coding unit or a decoding unit by an output unit.
摘要翻译: 由输入单元输入的主键(K2,2)存储在存储单元中。 矩阵生成单元生成关于通过划分主键(K2,2)的键分割单元获得的分割键(eR2,eR1,eR3)中的每一个的键元素矩阵(M1-M3)。 对于键元素矩阵(M1-M3)的每个坐标条目,分配通过用单向哈希函数重复哈希运算而连续获得的运算数据,以保持可伸缩性(L)的层次性质。 密钥生成单元基于密钥要素矩阵(M1-M3),生成与所述可扩展性(R,L)的各层次对应的部分密钥(K1,1-K2,2)。 这些部分键(K1,1-K2,2)通过输出单元输出到编码单元或解码单元。
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公开(公告)号:US20100020966A1
公开(公告)日:2010-01-28
申请号:US12522642
申请日:2008-11-04
申请人: Yoichi Hata , Toshiaki Kakii , Yasuhito Fujita , Yoshimitsu Goto , Hitoshi Kiya , Kiyoshi Nishikawa , Masaaki Fujiyoshi , Shoko Imaizumi
发明人: Yoichi Hata , Toshiaki Kakii , Yasuhito Fujita , Yoshimitsu Goto , Hitoshi Kiya , Kiyoshi Nishikawa , Masaaki Fujiyoshi , Shoko Imaizumi
CPC分类号: H04L9/0861 , H04L9/088
摘要: The present invention relates to an encryption key generating method ensuring resistance to collusion attacks and achieving reduction in a key length of encryption keys corresponding to respective hierarchies of each scalability. In the encryption key generating method, an encryption key (K2,2) corresponding to data in the lowest hierarchies of hierarchical scalabilities (R, L) is divided as a master key by the number of hierarchies in scalability (R). Key element matrices (M1-M3) generated with respective split keys (eR2, eR1, eR3) are assigned operation data successively obtained by repeating a hash operation with a one-way hash function, so as to maintain hierarchical nature of scalability (L). Partial keys (K1,1-K2,2) corresponding to respective hierarchies of the scalabilities (R, L) are generated by combining key elements coordinately consistent among the key element matrices (M1-M3).
摘要翻译: 本发明涉及一种确保抵抗串通攻击的加密密钥生成方法,并且实现与每个可扩展性的各个层级对应的加密密钥的密钥长度的减少。 在加密密钥生成方法中,对应于分级可缩放度(R,L)的最低层次中的数据的加密密钥(K2,2)被划分为可扩展性(R)的层次数的主密钥。 通过利用单向散列函数重复散列运算而连续获得的运算数据被分配给分解密钥(eR2,eR1,eR3)生成的关键要素矩阵(M1-M3),从而保持分级性质(L) 。 通过组合键元素矩阵(M1-M3)中协调一致的关键元素来生成与可伸缩性(R,L)的各个层次相对应的部分密钥(K1,1-K2,2)。
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公开(公告)号:US20120121088A1
公开(公告)日:2012-05-17
申请号:US13283877
申请日:2011-10-28
申请人: Yoichi HATA , Toshiaki Kakii , Yasuhito Fujita , Yoshimitsu Goto , Hitoshi Kiya , Kiyoshi Nishikawa , Masaaki Fujiyoshi , Shoko Imaizumi
发明人: Yoichi HATA , Toshiaki Kakii , Yasuhito Fujita , Yoshimitsu Goto , Hitoshi Kiya , Kiyoshi Nishikawa , Masaaki Fujiyoshi , Shoko Imaizumi
IPC分类号: H04K1/00
CPC分类号: H04L9/0836 , H04L9/085 , H04L2209/38
摘要: A master key (K2,2) inputted by an input unit is stored in a storage unit. A matrix generating unit generates key element matrices (M1-M3) with respect to each of split keys (eR2, eR1, eR3) obtained by a key dividing unit dividing the master key (K2,2). To each coordinate entry of the key element matrices (M1-M3), operation data that successively obtained by repeating a hash operation with a one-way hash function is assigned, so as to maintain hierarchical nature of scalability (L). A key generating unit generates partial keys (K1,1-K2,2) corresponding to respective hierarchies of the scalabilities (R, L), on the basis of the key element matrices (M1-M3). These partial keys (K1,1-K2,2) are outputted to a coding unit or a decoding unit by an output unit.
摘要翻译: 由输入单元输入的主键(K2,2)存储在存储单元中。 矩阵生成单元生成关于通过划分主键(K2,2)的键分割单元获得的分割键(eR2,eR1,eR3)中的每一个的键元素矩阵(M1-M3)。 对于键元素矩阵(M1-M3)的每个坐标条目,分配通过用单向哈希函数重复哈希运算而连续获得的运算数据,以保持可伸缩性(L)的层次性质。 密钥生成单元基于密钥要素矩阵(M1-M3),生成与所述可扩展性(R,L)的各层次对应的部分密钥(K1,1-K2,2)。 这些部分键(K1,1-K2,2)通过输出单元输出到编码单元或解码单元。
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