International Association for Cryptologic Research

International Association
for Cryptologic Research


Actively Secure Setup for SPDZ

Dragos Rotaru
Nigel P. Smart
Titouan Tanguy
Frederik Vercauteren
Tim Wood
DOI: 10.1007/s00145-021-09416-w
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Abstract: We present the first actively secure, practical protocol to generate the distributed secret keys needed in the SPDZ offline protocol. As an added bonus our protocol results in the resulting distribution of the public and secret keys are such that the associated SHE ‘noise’ analysis is the same as if the distributed keys were generated by a trusted setup. We implemented the presented protocol for distributed BGV key generation within the SCALE-MAMBA   framework. Our method makes use of a new method for creating doubly (or even more) authenticated bits in different MPC engines, which has applications in other areas of MPC-based secure computation. We were able to generate keys for two parties and a plaintext size of 64 bits in around 5 min, and a little more than 18 min for a 128-bit prime.
  title={Actively Secure Setup for SPDZ},
  journal={Journal of Cryptology},
  author={Dragos Rotaru and Nigel P. Smart and Titouan Tanguy and Frederik Vercauteren and Tim Wood},