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Patent Searching and Data


Title:
DIGITAL SIGNATURE SERVER AND USER TERMINAL
Document Type and Number:
WIPO Patent Application WO/2011/064844
Kind Code:
A1
Abstract:
Disclosed is a digital signature server that simultaneously reduces load on user terminals and server-side load resulting from verifying digital signatures. A signing key matrix (KM) arrays a plurality of signing keys (Ki-j) in a matrix of m rows by n columns, and is stored in a signing key matrix database (21). The relation between a signing key set (CK), which is a set of signing keys arbitrarily selected from each of the n columns thereof, and a user terminal (30), is stored in a relational information database (22). A digital signature generation unit (24) encrypts a content digest (D), which is generated on the basis of digital content (C), with each of n signing keys that are included in the signing key matrix (KM), and generates a digital signature in a matrix configuration thereupon.

Inventors:
SUU, Hiroshi (Toshiba Corporation 1-1, Shibaura 1-chome, Minato-k, Tokyo 01, 〒1058001, JP)
嵩 比呂志 (〒01 東京都港区芝浦一丁目1番1号 株式会社 東芝 知的財産部内 Tokyo, 〒1058001, JP)
MIURA, Akira (Toshiba Corporation 1-1, Shibaura 1-chome, Minato-k, Tokyo 01, 〒1058001, JP)
三浦 顕彰 (〒01 東京都港区芝浦一丁目1番1号 株式会社 東芝 知的財産部内 Tokyo, 〒1058001, JP)
Application Number:
JP2009/069843
Publication Date:
June 03, 2011
Filing Date:
November 25, 2009
Export Citation:
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Assignee:
Kabushiki Kaisha Toshiba (1-1 Shibaura 1-chome, Minato-ku Tokyo, 01, 〒1058001, JP)
株式会社 東芝 (〒01 東京都港区芝浦一丁目1番1号 Tokyo, 〒1058001, JP)
SUU, Hiroshi (Toshiba Corporation 1-1, Shibaura 1-chome, Minato-k, Tokyo 01, 〒1058001, JP)
嵩 比呂志 (〒01 東京都港区芝浦一丁目1番1号 株式会社 東芝 知的財産部内 Tokyo, 〒1058001, JP)
MIURA, Akira (Toshiba Corporation 1-1, Shibaura 1-chome, Minato-k, Tokyo 01, 〒1058001, JP)
International Classes:
H04L9/32; G09C1/00
Foreign References:
JP2006074421A2006-03-16
JP2008176814A2008-07-31
JP2008269088A2008-11-06
JP2007164933A2007-06-28
JP2009194640A2009-08-27
JP2006284720A2006-10-19
Attorney, Agent or Firm:
ITAMI, Masaru et al. (Murata Bldg, Suite 4A 2-5, Kanda-Surugadai, Chiyoda-k, Tokyo 62, 〒1010062, JP)
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