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Malicious Security for SCALES: Outsourced Computation with Ephemeral Servers

Authors:
Anasuya Acharya , Bar-Ilan University
Carmit Hazay , Bar-Ilan University
Vladimir Kolesnikov , Georgia Institute of Technology
Manoj Prabhakaran , Indian Institute of Technology Bombay
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Conference: CRYPTO 2024
Abstract: SCALES (Small Clients And Larger Ephemeral Servers) model is a recently proposed model for MPC (Acharya et al., TCC 2022). While the SCALES model offers several attractive features for practical large-scale MPC, the result of Acharya et al. only offered semi-honest secure protocols in this model. We present a new efficient SCALES protocol secure against malicious adversaries, for general Boolean circuits. We start with the base construction of Acharya et al. and design and use a suite of carefully defined building blocks that may be of independent interest. The resulting protocol is UC-secure without honest majority, with a CRS and bulletin-board as setups, and allows publicly identifying deviations from correct execution.
BibTeX
@inproceedings{crypto-2024-34181,
  title={Malicious Security for SCALES: Outsourced Computation with Ephemeral Servers},
  publisher={Springer-Verlag},
  author={Anasuya Acharya and Carmit Hazay and Vladimir Kolesnikov and Manoj Prabhakaran},
  year=2024
}