Cryptology ePrint Archive: Report 2008/415

Asynchronous Multiparty Computation: Theory and Implementation

Ivan Damgård, Martin Geisler, Mikkel Krøigaard, Jesper Buus Nielsen

Abstract: We propose an asynchronous protocol for general multiparty computation with perfect security and communication complexity O(n^2 |C| k) where n is the number of parties, |C| is the size of the arithmetic circuit being computed, and k is the size of elements in the underlying field. The protocol guarantees termination if the adversary allows a preprocessing phase to terminate, in which no information is released. The communication complexity of this protocol is the same as that of a passively secure solution up to a constant factor. It is secure against an adaptive and active adversary corrupting less than n/3 players.

We also present a software framework for implementation of asynchronous protocols called VIFF (Virtual Ideal Functionality Framework), which allows automatic parallelization of primitive operations such as secure multiplications, without having to resort to complicated multithreading. Benchmarking of a VIFF implementation of our protocol confirms that it is applicable to practical non-trivial secure computations. VIFF can be downloaded from

Category / Keywords: implementation / multiparty computation

Date: received 29 Sep 2008, last revised 27 Oct 2008

Contact author: buus at daimi au dk

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Version: 20081027:113257 (All versions of this report)

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