Title:
SIGNING SYSTEM, AND SIGNING METHOD
Document Type and Number:
WIPO Patent Application WO/2022/239647
Kind Code:
A1
Abstract:
A grouping terminal holds an individual signature based on biometric information of a user of a first signature terminal included in a plurality of signature terminals, and verification keys based on biometric information of each user of the plurality of signature terminals, generates a group verification key on the basis of each of the verification keys of the plurality of signature terminals, generates a group signature on the basis of the verification key of the first signature terminal, the individual signature, and a random vector, generates a zero-knowledge proof value on the basis of the verification keys of each of the plurality of signature terminals, and transmits the group verification key, the group signature, and the zero-knowledge proof value to a verification terminal, and the verification terminal verifies the group signature on the basis of the group verification key and the zero-knowledge proof value.
Inventors:
KAWANA NON (JP)
NAGANUMA KEN (JP)
TAKAHASHI KENTA (JP)
MOTOMIYA YUKIE (JP)
HABUCHI TAKAYUKI (JP)
NAGANUMA KEN (JP)
TAKAHASHI KENTA (JP)
MOTOMIYA YUKIE (JP)
HABUCHI TAKAYUKI (JP)
Application Number:
PCT/JP2022/018969
Publication Date:
November 17, 2022
Filing Date:
April 26, 2022
Export Citation:
Assignee:
HITACHI LTD (JP)
International Classes:
H04L9/32
Domestic Patent References:
| WO2019235095A1 | 2019-12-12 |
Other References:
LEE, SEONG-WHAN ; LI, STAN Z: "SAT 2015 18th International Conference, Austin, TX, USA, September 24-27, 2015", vol. 5312 Chap.15, 25 November 2008, SPRINGER , Berlin, Heidelberg , ISBN: 3540745491, article BRINGER JULIEN; CHABANNE HERVé; POINTCHEVAL DAVID; ZIMMER SéBASTIEN: "An Application of the Boneh and Shacham Group Signature Scheme to Biometric Authentication", pages: 219 - 230, XP047428143, 032548, DOI: 10.1007/978-3-540-89598-5_15
YUTA YONEYAMA, KENTA TAKAHASHI, EISEI MOTOBU, MASAKATSU NISHIGAKI: "4A1-1 Fuzzy Signature for biometric signature", PROCEEDINGS OF SYMPOSIUM ON CRYPTOGRAPHY AND INFORMATION SECURITY 2012; KANAZAWA, JAPAN, JAN. 30- FEB. 2, 2012, 1 January 2012 (2012-01-01) - 2 February 2012 (2012-02-02), JP, pages 1 - 7, XP009541281
KAWANA NON: "Group Signature Technology with Fuzzy Key", SYMPOSIUM ON CRYPTOGRAPHYAND INFORMATION SECURITY, SPRINGER, 1 January 2022 (2022-01-01), pages 1, XP093004722
YUTA YONEYAMA, KENTA TAKAHASHI, EISEI MOTOBU, MASAKATSU NISHIGAKI: "4A1-1 Fuzzy Signature for biometric signature", PROCEEDINGS OF SYMPOSIUM ON CRYPTOGRAPHY AND INFORMATION SECURITY 2012; KANAZAWA, JAPAN, JAN. 30- FEB. 2, 2012, 1 January 2012 (2012-01-01) - 2 February 2012 (2012-02-02), JP, pages 1 - 7, XP009541281
KAWANA NON: "Group Signature Technology with Fuzzy Key", SYMPOSIUM ON CRYPTOGRAPHYAND INFORMATION SECURITY, SPRINGER, 1 January 2022 (2022-01-01), pages 1, XP093004722
Attorney, Agent or Firm:
TOU-OU PATENT FIRM (JP)
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