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A subexponential construction of graph coloring for multiparty computation

Authors

Hassan Asghar, Yvo Desmedt, Josef Pieprzyk and Steinfeld Ron

NICTA

Macquarie University

University of Texas at Dallas

Queensland University of Technology

Monash University

Abstract

We show the first deterministic construction of an unconditionally secure multiparty computation (MPC) protocol in the passive adversarial model over black-box non-Abelian groups which is both optimal (secure against an adversary who possesses any t < n/2 inputs) and has subexponential complexity of construction based on coloring of planar graphs. More specifically, following the result of Desmedt et al. (2012) that the problem of MPC over non-Abelian groups can be reduced to finding a t-reliable n-coloring of planar graphs, we show the construction of such a graph which allows a path from the input nodes to the output nodes when any t-party subset is in the possession of the adversary. Unlike the deterministic constructions from Desmedt et al.\ (2012) our construction has subexponential complexity and is optimal at the same time, i.e., it is secure for any t < n/2.

BibTeX Entry

  @article{Asghar_DPR_14,
    journal          = {Journal of Mathematical Cryptology},
    author           = {Asghar, Hassan and Desmedt, Yvo and Pieprzyk, Josef and Ron, Steinfeld},
    number           = {4},
    month            = dec,
    volume           = {8},
    year             = {2014},
    keywords         = {multiparty computation, graph coloring, non-abelian group, planar graph.},
    title            = {A Subexponential Construction of Graph Coloring for Multiparty Computation},
    pages            = {363403}
  }

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