Electronic document processing system and method of forming digi

Details Electronic document processing system and method of forming digi Electronic document processing system and method of forming digi

1993-11-29

1995-11-07

Cain, David C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 30, 380 49, H04K 100

Patent

active

054652995

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.

REFERENCES:
patent: 4885777 (1989-12-01), Takaragi et al.
patent: 5018195 (1991-05-01), Takaragi et al.
Tsujii, Shigeo, et al. "Cryptography and Information Security," published by Shokodo, pp. 127-147. (Provided in Japanese).

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