Cryptology ePrint Archive: Report 2010/318

Multiparty Computation for Dishonest Majority: from Passive to Active Security at Low Cost

Ivan Damgård and Claudio Orlandi

Abstract: Multiparty computation protocols have been known for more than twenty years now, but due to their lack of efficiency their use is still limited in real-world applications: the goal of this paper is the design of efficient two and multi party computation protocols aimed to fill the gap between theory and practice. We propose a new protocol to securely evaluate reactive arithmetic circuits, that offers security against an active adversary in the universally composable security framework. Instead of the ``do-and-compile'' approach (where the parties use zero-knowledge proofs to show that they are following the protocol) our key ingredient is an efficient version of the ``cut-and-choose'' technique, that allow us to achieve active security for just a (small) constant amount of work more than for passive security.

Category / Keywords: cryptographic protocols /

Publication Info: Full version of a CRYPTO 2010 paper.

Date: received 27 May 2010

Contact author: orlandi at cs au dk

Available format(s): Postscript (PS) | Compressed Postscript (PS.GZ) | PDF | BibTeX Citation

Version: 20100531:141030 (All versions of this report)

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