| 摘要 |
A method for generating a digital signature with respect to an electronic document, the method including: inputting a target electronic document and a corresponding digital signature &sgr;; dividing the target electronic document into a plurality of partial documents mi; and when a revision of the partial documents is to be performed, in a case where deletion of the one partial document is to be performed, when sanitization is not prohibited, exponentiating the digital signature &sgr; twice with a hash value Gi, when sanitization is prohibited, exponentiating &sgr; with the Gi; in a case where sanitization is to be performed, replacing a partial document by Gi; in a case where deletion is to be prohibited, exponentiating &sgr; with a hash value Hi; in a case where the sanitization is to be prohibited, exponentiating &sgr; with Gi; and updating &sgr;.
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