Electronic document processing system and method of forming digital signature
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 7, 1995
Grant Date -
N/A
app pub date -
Nov 29, 1993
filing date -
Dec 3, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a terminal which received an electronic document with at leastone digital signature, when a user changes the contents of the received electronic document, a new digital signature is produced by enciphering signature data by using a secret key of the user, the signature data including a hash total of the document of a new version, personal information of the user (signatory), and version management information necessary to restore an electronic document of a former version from the electronic document of the new version. The new digital signature and the new version electronic document version are transmitted together with the received digital signature to a next person on a document circulating route.
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