| 摘要 |
PROBLEM TO BE SOLVED: To provide an electronic document authenticity assurance technique and a document management system both of which can compatibly realize the assurance of the authenticity of the disclosure documents and the deletion of information inappropriate for disclosure. SOLUTION: A seed value (r) of a random number is generated, and an exclusive OR C of a random number stream of (n) bits generated from the seed value (r) using a pseudo-random generator configured using hard-core bits (b) of a unidirectional function (f) and an electronic document M of (n) bits to give a signature thereto is computed, an electronic signature SIG is generated for data containing C and f^(n+1)(r) obtained by applying the unidirectional function (f) to the seed value (r) (n+1) times, and data containing the electronic document M, the seed value (r) and the electronic signature value SIG are outputted as a signed electronic document. COPYRIGHT: (C)2007,JPO&INPIT
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