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公开(公告)号:US20090222929A1
公开(公告)日:2009-09-03
申请号:US12393757
申请日:2009-02-26
申请人: Masanori NOGUCHI , Kazuhiro KAIYA , Kohji KAWAKAMI , Shinichi MATSUKAWA , Norikazu HOSAKA , Akihiro KASAHARA , Akira MIURA , Shigeru MIYASHITA
发明人: Masanori NOGUCHI , Kazuhiro KAIYA , Kohji KAWAKAMI , Shinichi MATSUKAWA , Norikazu HOSAKA , Akihiro KASAHARA , Akira MIURA , Shigeru MIYASHITA
CPC分类号: G06F21/10 , G06F11/1458 , G06F11/1469 , G06F21/6272 , G06F2221/2143 , G06F2221/2151 , H04L9/0822 , H04L9/0833 , H04L2209/60
摘要: A recording device which backs up a content α in a recording medium and a recording device which restores the content are registered in a server so as to belong to the same domain group. When the recording device tries to restore the content, the restore is permitted only when both the recording devices belong to the same domain group. When there is a refresh request of the domain group, the domain group is invalidated only when a refresh period has passed. When a refresh number recorded in the recording device is less than or equal to the refresh number recorded in the recording device, the recording device backs up and locally merges the content recorded in the recording device into the recording medium.
摘要翻译: 将备份记录介质中的内容α的记录装置和恢复内容的记录装置登记在服务器中以属于同一域组。 当记录设备尝试恢复内容时,只有当两个记录设备属于同一个域组时才允许恢复。 当域组有刷新请求时,仅当刷新时间段过去时,域组才会失效。 当记录在记录装置中的刷新号码小于或等于记录装置中记录的刷新次数时,记录装置备份并将记录在记录装置中的内容局部地合并到记录介质中。
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公开(公告)号:US20080232580A1
公开(公告)日:2008-09-25
申请号:US12051524
申请日:2008-03-19
申请人: Norikazu HOSAKA , Yoshihiro Fujii , Minako Tada , Takehisa Kato
发明人: Norikazu HOSAKA , Yoshihiro Fujii , Minako Tada , Takehisa Kato
IPC分类号: H04L9/28
CPC分类号: H04L9/085
摘要: A secret sharing apparatus according to the present invention is based on a (k,n)-threshold scheme with a threshold of at least 4. The secret sharing apparatus generates a generator matrix (G) of GF(2) in which any k of n column vectors are at a full rank, divides secret information into n−1 pieces to generate divided secret data (K(1), . . . , K(n−1)), generates random data (U(0,1), . . . , U(k−2,n−1)), calculates the product of matrixes of the divided secret data, the random data, and the generator matrix (G), assigns the j×(n−1)+ith column of the calculation result to sharing partial data (D(j,i)) to calculate sharing partial data (D(j,1)), generates header information (H(j)), and individually distributes n pieces of sharing information (D(0), . . . , D(n−1)) made up of the header information (H(j)) and sharing partial data (D(j,i)) to n storage apparatuses.
摘要翻译: 根据本发明的秘密共享装置基于具有至少4的阈值的(k,n)阈值方案。秘密共享装置生成GF(2)的生成矩阵(G),其中任何k n个列向量处于满秩,将秘密信息划分为n-1个部分,以产生分割的秘密数据(K(1),...,K(n-1)),生成随机数据(U(0,1) ,...,U(k-2,n-1))计算分割的秘密数据,随机数据和生成矩阵(G)的矩阵的乘积,分配jx(n-1)+ i 计算结果的列以共享部分数据(D(j,i))以计算共享部分数据(D(j,1)),生成头信息(H(j)),并且分别分配n个共享信息 (H(j))和共享部分数据(D(j,i))组成的D(0),...,D(n-1))。
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