发明名称 |
Electronic document processing system and method of forming digital signature |
摘要 |
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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申请公布号 |
US5465299(A) |
申请公布日期 |
1995.11.07 |
申请号 |
US19930158618 |
申请日期 |
1993.11.29 |
申请人 |
HITACHI, LTD.;HITACHI CHUBU SOFTWARE, LTD. |
发明人 |
MATSUMOTO, HIROSHI;TAKARAGI, KAZUO;SUSAKI, SEIICHI;MAEZAWA, HIROYUKI;KOIZUMI, SHINOBU |
分类号 |
H04L9/32;(IPC1-7):H04K1/00 |
主分类号 |
H04L9/32 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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