发明授权
US08433910B2 Electronic signature method, apparatus, and recording medium having electronic signature program recorded thereon
有权
具有记录在其上的电子签名程序的电子签名方法,装置和记录介质
- 专利标题: Electronic signature method, apparatus, and recording medium having electronic signature program recorded thereon
- 专利标题(中): 具有记录在其上的电子签名程序的电子签名方法,装置和记录介质
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申请号: US12356845申请日: 2009-01-21
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公开(公告)号: US08433910B2公开(公告)日: 2013-04-30
- 发明人: Masahiko Takenaka , Tetsuya Izu
- 申请人: Masahiko Takenaka , Tetsuya Izu
- 申请人地址: JP Kawasaki
- 专利权人: Fujitsu Limited
- 当前专利权人: Fujitsu Limited
- 当前专利权人地址: JP Kawasaki
- 代理机构: Fujitsu Patent Center
- 优先权: JP2008-010418 20080121
- 主分类号: H04L9/32
- IPC分类号: H04L9/32
摘要:
A computer divides a target electronic document into a plurality of document segments. Then, the computer generates a signature (s, t) that includes a set of two values having a signature value s forming a signature on the electronic document and a deletion signature value t used for deletion, the signature value s which serves as a body of the signature being formed by a superposition of signature information on the individual document segments. Then, in a case where one of the plurality of document segments obtained by the division is to be extracted, the computer superimposes deletion information of a document segment to be deleted on the deletion signature value t to generate a new signature value t′, and produces an updated signature (s, t′).