| 摘要 |
PROBLEM TO BE SOLVED: To make quickly and properly processable secret document information, to make clear the secret part of the secret document information and to make properly manageable the secret of the secret document information by its providing side. SOLUTION: A secret area is designated in the document information via an area designation part 12, and a partial document information on the designated area is enciphered at an encipherment part 13 to obtain the enciphered information. At a management information generation part 14, the address information on the designated area and the key information on the encipherment are stored in a management table and the management information is generated. Then, the part 14 replaces an object area included in the text of the document information, i.e., the designated area with the enciphered information via the part 13 and transmits or stores the enciphered information together with the management information. |
