## Cryptology ePrint Archive: Report 2014/081

Efficient Round Optimal Blind Signatures

Sanjam Garg and Divya Gupta

Abstract: Known constructions of blind signature schemes suffer from at least one of the following limitations: (1) rely on parties having access to a common reference string or a random oracle, (2) are not round-optimal, or (3) are prohibitively expensive.

In this work, we construct the \emph{first} blind-signature scheme that does not suffer from any of these limitations. In other words, besides being round optimal and having a standard model proof of security, our scheme is very efficient. Specifically, in our scheme, one signature is of size $6.5$ KB and the communication complexity of the signing protocol is roughly $100$ KB. An amortized variant of our scheme has communication complexity less that $1$ KB.

Category / Keywords: public-key cryptography / Blind Signatures, Round Complexity, Efficiency, Complexity Leveraging

Original Publication (with major differences): IACR-EUROCRYPT-2014

Date: received 4 Feb 2014, last revised 4 Feb 2014

Contact author: divyag at cs ucla edu

Available format(s): PDF | BibTeX Citation

Short URL: ia.cr/2014/081

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