| 摘要 |
PROBLEM TO BE SOLVED: To separately process a digital signature without adding to to a file by receiving a document and also verifying the document by using the digital signature. SOLUTION: This device includes a document transmitting device 1 which generates a document, generates a digital signature from the document and transmits the document and the digital signature separate from each other, a document verification information management device 3 which receives and stores the digital signature, and a document receiving device 2 which receives the document and verifies the document by means of the digital signature stored in the device 3. In such a constitution, the application that produced a file of a file system can be processed and also it's possible to verify the alteration of the file and to authenticate the producer of the file. In addition, even a document management organ that has no information storage device of large capacity can have an assurance function by storing and managing only the digital signature of a document. |
