Cryptology ePrint Archive: Report 2004/108

Two Improved Partially Blind Signature Schemes from Bilinear Pairings

Sherman S.M. Chow and Lucas C.K. Hui and S.M. Yiu and K.P. Chow

Abstract: A blind signature scheme is a protocol for obtaining a digital signature from a signer, but the signer can neither learn the messages he/she sign nor the signatures the recipients obtain afterwards. Partially blind signature is a variant such that part of the message contains pre-agreed information (agreed by the signer and the signature requester) in unblinded form, while threshold blind signature distributes the signing power to a group of signers such that a signature can only be produced by interacting with a predetermined numbers of signers. In this paper, we propose a threshold partially blind signature scheme from bilinear pairings and an ID-based partially blind signature scheme, which are provably secure in the random oracle model. To the best of authors' knowledge, we give the first discussion on these two notions.

Category / Keywords: public-key cryptography / threshold partially blind signature, identity-based partially blind signature, bilinear pairings

Publication Info: In Colin Boyd and Juan Gonzalez Nieto, editors, Information Security and Privacy: 10th Australasian Conference, ACISP 2005, Brisbane, Australia, July 4-6, 2005. Proceedings. Lecture Notes in Computer Science.

Date: received 29 Apr 2004, last revised 25 Apr 2005

Contact author: smchow at cs hku hk

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Version: 20050425:090509 (All versions of this report)

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