METHOD AND DEVICE FOR CERTIFICATELESS PARTIALLY BLIND SIGNATURE

WIPO Patent Application WO/2018/119670

A1

The present invention belongs to the field of information security technology. A method for certificateless partially blind signature (CL-PBS), comprising: establishing a public system parameter params={G1, G2, P, e, g, H0, H1, H2, Ppub}; a signer extracting (SID) as a private key and extracting (P) as a public key; the signer randomly selecting γ∈Z*q, and calculating z=H0(c) and R=rP, and transmitting R to a signature requester; having received R, the signature requester randomly selecting blinding factors α and β∈Z*q, and calculating z=H0(c), R'=αR, (y), h'=H2(m, z, y), h=α-1(β-h'), and transmitting h to the signer; having received h, the signer calculating (S), and transmitting S to the signature requester; the signature requester performing an unblinding operation, calculating S'=αS, and obtaining σ= (y, h', S') as a signature for a message m and a negotiation message c; and a verifier performing signature verification. The method effectively solves the security problem caused by the falsification of negotiation public information during the CL-PBS.

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ZHANG PENG (CN)
LI JUNCHAO (CN)
YU JIANPING (CN)

PCT/CN2016/112385

July 05, 2018

December 27, 2016

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UNIV SHENZHEN (CN)

H04L9/08

CN102387019A	2012-03-21
US20150358167A1	2015-12-10

CHENG LIN: "Research on Provably Secure Certificateless Signature Schemes", CDFD INFORMATION TECHNOLOGY, no. 4, 15 April 2015 (2015-04-15), pages 66 - 67

HENSEN INTELLECTUAL PROPERTY FIRM (CN)

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