[Resource Topic] 2004/108: Two Improved Partially Blind Signature Schemes from Bilinear Pairings

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Two Improved Partially Blind Signature Schemes from Bilinear Pairings

Authors: Sherman S. M. Chow, Lucas C. K. Hui, S. M. Yiu, K. P. Chow


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.

ePrint: https://eprint.iacr.org/2004/108

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