[Resource Topic] 2024/383: Malicious Security for SCALES: Outsourced Computation with Ephemeral Servers

Welcome to the resource topic for 2024/383

Title:
Malicious Security for SCALES: Outsourced Computation with Ephemeral Servers

Authors: Anasuya Acharya, Carmit Hazay, Vladimir Kolesnikov, Manoj Prabhakaran

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.

ePrint: https://eprint.iacr.org/2024/383

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