Abstract
Recent improvements in the state-of-the-art of MPC for non-full-threshold access structures introduced the idea of using a collision-resistant hash functions and redundancy in the secret-sharing scheme to construct a communication-efficient MPC protocol which is computationally-secure against malicious adversaries, with abort. The prior work is based on replicated secret-sharing; in this work we extend this methodology to any LSSS implementing a \(\mathcal {Q}_{2}\) access structure. To do so we need to establish a folklore property of error detection for such LSSS and their associated Monotone Span Programs. In doing so we obtain communication-efficient online and offline protocols for MPC in the pre-processing model.
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Notes
- 1.
In the full version we provide a formal description of MSPs in which all qualified sets of parties can reconstruct the entire share vector and explain how such MSPs are “good” for our protocol.
- 2.
If using a small ring/finite field we simply need to modify the sacrificing stage in the triple production process; no changes are needed for the online phase at all.
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Acknowledgements
We thank for the anonymous reviewers for their helpful comments and remarks. This work has been supported in part by ERC Advanced Grant ERC-2015-AdG-IMPaCT, by the Defense Advanced Research Projects Agency (DARPA) and Space and Naval Warfare Systems Center, Pacific (SSC Pacific) under contract No. N66001-15-C-4070, and by EPSRC via grant EP/N021940/1.
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Smart, N.P., Wood, T. (2019). Error Detection in Monotone Span Programs with Application to Communication-Efficient Multi-party Computation. In: Matsui, M. (eds) Topics in Cryptology – CT-RSA 2019. CT-RSA 2019. Lecture Notes in Computer Science(), vol 11405. Springer, Cham. https://doi.org/10.1007/978-3-030-12612-4_11
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