Title:
ANONYMIZED SIGNATURE SYSTEM, SIGNATURE GENERATION DEVICE, ANONYMIZED SIGNATURE GENERATION DEVICE, VERIFICATION DEVICE, ANONYMIZED SIGNATURE METHOD AND PROGRAM
Document Type and Number:
WIPO Patent Application WO/2020/240654
Kind Code:
A1
Abstract:
An anonymized signature system in which a signature σ is anonymized by an agent designated by a signatory is characterized by comprising: a system parameter generation means that receives a safe parameter as an input thereto and generates a system parameter ρ that is not present in the agent; a setup means that receives the system parameter ρ as an input thereto and generates an agent secret key w and an agent public key gA; a key generation means that receives the system parameter ρ as an input thereto and generates a secret key x and a public key y of the signatory; a signature generation means that receives as inputs thereto the secret key x, a message m to which the signature σ is to be assigned, and the agent public key gA of the agent designated by the signatory and generates the signature σ for the message m; an anonymizing means that receives as inputs thereto an identifier i of the signatory, the agent secret key w, the signature σ, a ring L indicating a group to which the signatory belongs, a list yL of the public key y of the signatory belonging to the ring L, and the message m and generates a ring signature σ' obtained by anonymizing the signature σ; and a verification means that receives as inputs thereto the ring L, the list yL, the message m and the ring signature σ' and outputs a verification result b of the message m.
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Inventors:
HOSHINO FUMITAKA (JP)
Application Number:
PCT/JP2019/020875
Publication Date:
December 03, 2020
Filing Date:
May 27, 2019
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
H04L9/32; G09C1/00
Domestic Patent References:
| WO2015105479A1 | 2015-07-16 |
Foreign References:
| JP2003067532A | 2003-03-07 |
Other References:
KOBAYASHI, TETSUTARO ET AL. ET AL.: "Agent- Designated Anonymizable Signature", 2019 SYMPOSIUM ON CRYPTOGRAPHY AND INFORMATION SECURITY (SCIS2019), vol. 4A2- 2, 22 January 2019 (2019-01-22), pages 1 - 5
Attorney, Agent or Firm:
ITOH, Tadashige et al. (JP)
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