Electronic signature method, apparatus, and recording medium having electronic signature program recorded thereon
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United States of America Patent
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Apr 30, 2013
Grant Date -
Jul 30, 2009
app pub date -
Jan 21, 2009
filing date -
Jan 21, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
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′).
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