Paper 2017/262

When It’s All Just Too Much: Outsourcing MPC-Preprocessing

Peter Scholl, Nigel P. Smart, and Tim Wood


Most modern actively secure multiparty computation protocols make use of a function and input independent pre-processing phase. This pre-processing phase is tasked with producing some form of correlated randomness and distributing it to the parties. Whilst the “online” phase of such protocols is exceedingly fast, the bottleneck comes in the pre-processing phase. In this paper we examine situations where the computing parties in the online phase may want to outsource the pre-processing phase to another set of parties, or to a sub-committee. We examine how this can be done, and also describe situations where this may be a benefit.

Available format(s)
Cryptographic protocols
Publication info
Published elsewhere. Major revision.IMA Cryptography and Coding 2017
Contact author(s)
nigel @ cs bris ac uk
t wood @ bristol ac uk
peter scholl @ cs au dk
2017-09-12: last of 3 revisions
2017-03-25: received
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Creative Commons Attribution


      author = {Peter Scholl and Nigel P.  Smart and Tim Wood},
      title = {When It’s All Just Too Much: Outsourcing MPC-Preprocessing},
      howpublished = {Cryptology ePrint Archive, Paper 2017/262},
      year = {2017},
      note = {\url{}},
      url = {}
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