Encryption apparatus, decryption apparatus and cryptography system
    1.
    发明公开
    Encryption apparatus, decryption apparatus and cryptography system 审中-公开
    Verschlüsselungsvorrichtung,EntschlüsselungsvorrichtungundVerschlüsselungssystem

    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.

    IPC分类号: H04L9/00

    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。