Apparatus, method, and program for digital signature
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United States of America Patent
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Apr 30, 2013
Grant Date -
Jul 1, 2010
app pub date -
Dec 22, 2009
filing date -
Dec 26, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
A digital signature method to generate a signature for an electronic document, the method including: initializing a signature t of each of the document segments of electronic document and twice raising the signature t to the power of a hash value of each of the document segments and digitally signing the raised signature to produce a signature s serving as the signature of the electronic document; and revising a document segment; wherein, in the revising, to delete a document segment, the signature t is raised twice to the power of the hash value of the document segment unless the document segment is sanitization prohibited, or the signature t is raised to the power of the hash value of the document if the document segment is sanitization prohibited, and the document segment is deleted; to sanitize a document segment, the document segment is replaced with the hash value thereof.
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