Title:
GROUP SIGNATURE SYSTEM, METHOD, DEVICE, AND PROGRAM
Document Type and Number:
WIPO Patent Application WO/2005/071880
Kind Code:
A1
Abstract:
A signature device (2) encrypts a first element of a member certificate by using a first random number and public information disclosed by a group management device (1) so as to generate encrypted data. Moreover, the signature device (2) converts the first element by using a random number and the public information so as to create first and second converted data. Moreover, the signature device (2) creates knowledge signature data from which the first element, the second element, and the information on the signature key will not be known and outputs a group signature including it together with a message. A verification device (3) verifies whether the group signature has been created by using a member certificate and a signature key of a member registered in the group.
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Inventors:
YONEZAWA SHOKO (JP)
FURUKAWA JUN (JP)
FURUKAWA JUN (JP)
Application Number:
PCT/JP2005/001177
Publication Date:
August 04, 2005
Filing Date:
January 21, 2005
Export Citation:
Assignee:
NEC CORP (JP)
YONEZAWA SHOKO (JP)
FURUKAWA JUN (JP)
YONEZAWA SHOKO (JP)
FURUKAWA JUN (JP)
International Classes:
G09C1/00; H04L9/32; (IPC1-7): H04L9/32; G09C1/00
Other References:
UMEDA K. ET AL: "A group signature Scheme based on Nyberg-Ryeppel Signatures.", 2003 NEN ANGO TO JOHO SECURITY SYMPOSIUM YOKOSHU., vol. 1, 2 January 2003 (2003-01-02) - 26 January 2003 (2003-01-26), pages 327 - 332, XP002991885
KATO P. ET AL: "Elgamal no Kokai Kagi Angokei ni Motozuku Group Shomei ni Yoru Shomei Protocol.", 1992 NEN THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS-SORITSU 75 SHUNEN KINEN-SHUKI TAIKAI KOEN RONBUNSHU., vol. 1, 15 September 1992 (1992-09-15), pages 1 - 187, XP002991886
YONEZAWA S. ET AL: "Kanrisha Bunsan ni Tekishita Group Shomei Hoshiki.", 2004 NEN ANGO TO JOHO SECURITY SYMPOSIUM YOKOSHU., vol. 2, 27 January 2004 (2004-01-27), pages 1167 - 1172, XP002991887
See also references of EP 1710954A4
KATO P. ET AL: "Elgamal no Kokai Kagi Angokei ni Motozuku Group Shomei ni Yoru Shomei Protocol.", 1992 NEN THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS-SORITSU 75 SHUNEN KINEN-SHUKI TAIKAI KOEN RONBUNSHU., vol. 1, 15 September 1992 (1992-09-15), pages 1 - 187, XP002991886
YONEZAWA S. ET AL: "Kanrisha Bunsan ni Tekishita Group Shomei Hoshiki.", 2004 NEN ANGO TO JOHO SECURITY SYMPOSIUM YOKOSHU., vol. 2, 27 January 2004 (2004-01-27), pages 1167 - 1172, XP002991887
See also references of EP 1710954A4
Attorney, Agent or Firm:
Matsumoto, Masao (Nishi-Ikebukuro 2-chome Toshima-ku, Tokyo 21, JP)
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