| 摘要 |
<P>PROBLEM TO BE SOLVED: To browse plaintext in accordance with an authority of a browsing person without inserting any identifier into the plaintext. <P>SOLUTION: An encryption apparatus 10 comprises: an encryption role information storage means 11 for storing encryption role information comprised of an encryption key corresponding to the authority of a browsing person and a key ID of the encryption key; an encryption processing means 12 for creating an encryption part by encrypting an encryption range using the encryption key of the encryption role information; an encrypted information creating means 13 for creating encrypted information comprised of a front-end position of the encryption part, its rear-end position, the key ID corresponding to the encryption key applied to the encryption part, and one or more records including a processing order of the encryption part; an encrypted document creating means 14 for creating an encrypted document by coupling an encrypted document body comprised of a document including the encryption part and the encrypted information; and an encrypted document storage means 15 for storing the encrypted document created by the encrypted document creating means on a predetermined medium. <P>COPYRIGHT: (C)2010,JPO&INPIT |
