Electronic document processing system and method of forming digital signature
US5465299A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Nov 29, 1993 |
| Grant date | Nov 7, 1995 |
| Priority date | — |
| Expiry date | Nov 29, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/60
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.