公开(公告)号：EP2056517A2

公开(公告)日：2009-05-06

申请号：EP08019103.4

申请日：2008-10-31

申请人： Hitachi Ltd.

发明人： Hatano, Yasou ,  Miyazaki, Kunihiko ,  Matsumoto, Kenji ,  Shimizu, Yoji

IPC分类号： H04L9/00

CPC分类号： H04L9/083 ,  H04L9/0863 ,  H04N1/32128 ,  H04N1/4486 ,  H04N2201/3242 ,  H04N2201/3277

摘要： Provided is a technology with which an electronic document including a plurality of elements such as texts and images may be partially encrypted and decrypted. An encryption-processing control unit receives a selection of electronic data included in an electronic document and a selection of an encryption key for encrypting the electronic data from among encryption keys stored in a storing unit. The encryption-processing control unit generates encrypted area data including partially encrypted data obtained by encrypting the selected electronic data with the selected encryption key, positional information for specifying a position of the selected electronic data in the electronic document, and decryption information including information that may specify a decryption key with which the partially encrypted data may be decrypted, and adds the encrypted area data to the electronic document.

摘要翻译： 提供了一种技术，其中包括诸如文本和图像的多个元素的电子文档可以被部分地加密和解密。 加密处理控制单元从存储在存储单元中的加密密钥中接收包括在电子文档中的电子数据的选择和用于加密电子数据的加密密钥的选择。 加密处理控制单元生成加密区域数据，该加密区域数据包括通过使用所选择的加密密钥加密所选择的电子数据而获得的部分加密数据，用于指定电子文档中所选择的电子数据的位置的位置信息，以及包括可能 指定可以解密部分加密的数据的解密密钥，并将加密的区域数据添加到电子文档。

公开(公告)号：EP1895739A3

公开(公告)日：2008-10-22

申请号：EP07017296.0

申请日：2007-09-04

申请人： Hitachi, Ltd.

发明人： Hatano, Yasuo ,  Miyazaki, Kunihiko ,  Matsumoto, Kenji ,  Shimizu, Yoji

IPC分类号： H04L29/06

CPC分类号： H04L9/0833 ,  G06F21/6209 ,  G06F2221/2107 ,  H04L9/0825 ,  H04L9/0869 ,  H04L9/0891 ,  H04L63/0442 ,  H04L63/062 ,  H04L2209/60

摘要： An encryption processing part of a controller of each of user devices specifies components of content as encryption target parts, creates an encryption key creation key by reading out a public key, for each of the encryption target parts, of a second user who is allowed to view the encryption target part, raising a secret key of an administrator of the content data to the power of the public key thus read out, and calculating a remainder, encrypts random numbers each corresponding to each of the encryption target parts by using the encryption key creation key, creates an encryption key for each of the encryption target parts, and encrypts, by using the encryption key created for each of the encryption target parts, each of the encryption target parts corresponding to the encryption key.

公开(公告)号：EP1895739A2

公开(公告)日：2008-03-05

申请号：EP07017296.0

申请日：2007-09-04

申请人： Hitachi, Ltd.

发明人： Hatano, Yasuo ,  Miyazaki, Kunihiko ,  Matsumoto, Kenji ,  Shimizu, Yoji

IPC分类号： H04L29/06

CPC分类号： H04L9/0833 ,  G06F21/6209 ,  G06F2221/2107 ,  H04L9/0825 ,  H04L9/0869 ,  H04L9/0891 ,  H04L63/0442 ,  H04L63/062 ,  H04L2209/60

摘要： An encryption processing part of a controller of each of user devices specifies components of content as encryption target parts, creates an encryption key creation key by reading out a public key, for each of the encryption target parts, of a second user who is allowed to view the encryption target part, raising a secret key of an administrator of the content data to the power of the public key thus read out, and calculating a remainder, encrypts random numbers each corresponding to each of the encryption target parts by using the encryption key creation key, creates an encryption key for each of the encryption target parts, and encrypts, by using the encryption key created for each of the encryption target parts, each of the encryption target parts corresponding to the encryption key.

摘要翻译： 每个用户设备的控制器的加密处理部分将内容的组成部分指定为加密对象部分，通过读出用于每个加密目标部分的公开密钥来创建加密密钥创建密钥，该第二用户被允许 查看加密目标部分，将内容数据的管理员的秘密密钥提高到由此读出的公共密钥的功率，并计算余数，通过使用加密密钥对与每个加密目标部分相对应的随机数进行加密 创建密钥，为每个加密目标部分创建加密密钥，并且通过使用为每个加密目标部分创建的加密密钥对与加密密钥相对应的每个加密目标部分进行加密。