| 摘要 |
PROBLEM TO BE SOLVED: To secure the strict authentication by adding a seal impression, a signature, etc., to a document and deforming the shapes of these seal impression, signature, etc., based on the feature value of the document. SOLUTION: A treatment device refers to the reference graphic data (C) on the seal prints, the signatures, etc., stored in a network server and applies a change (F) to the graphic data at a specific point (D) based on the feature value of the digest of the electronic document data. This result (E) can be recognized almost same as a reference graphic. At the verification side, the graphic data are separated from the approved electronic document data and the feature value that caused the change is calculated based on this graphic data and the reference graphic data. Then the coincidence is judged between the calculated feature value and the feature value that is obtained from the electronic document data. |
