Cryptology ePrint Archive: Report 2016/656

Improving Practical UC-Secure Commitments based on the DDH Assumption

Eiichiro Fujisaki

Abstract: At Eurocrypt 2011, Lindell presented practical static and adaptively UC-secure commitment schemes based on the DDH assumption. Later, Blazy {\etal} (at ACNS 2013) improved the efficiency of the Lindell's commitment schemes. In this paper, we present static and adaptively UC-secure commitment schemes based on the same assumption and further improve the communication and computational complexity, as well as the size of the common reference string.

Category / Keywords: cryptographic protocols / universally composable commitments, adaptive security, and public-key cryptography

Original Publication (with minor differences): SCN 2016

Date: received 26 Jun 2016

Contact author: eiichiro fujisaki at gmail com

Available format(s): PDF | BibTeX Citation

Note: This is an extended abstract of the paper with the same title that appears in SCN 2016.

Version: 20160628:011719 (All versions of this report)

Short URL: ia.cr/2016/656

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