Practical and Efficient FHE-based MPC

Nigel P. Smart

Paper 2023/981

Practical and Efficient FHE-based MPC

Nigel P. Smart

, COSIC, KU Leuven, Zama Inc.

Abstract

We present a reactive MPC protocol built from FHE which is robust in the presence of active adversaries. In addition the protocol enables reduced bandwidth via means of transciphering, and also enables more expressive/efficient programs via means of a $\mathsf{Declassify}$ operation. All sub-components of the protocol can be efficiently realised using existing technology. We prove our protocol secure in the UC framework.

Note: This update to the paper allows the FHE scheme to also support an encrypted PRF ability.

Metadata

Available format(s): PDF
Category: Cryptographic protocols
Publication info: Preprint.
Keywords: Fully Homomorphic Encryption Multi-Party Computation
Contact author(s): nigel smart @ kuleuven be
History: 2024-08-21: revised; 2023-06-23: received; See all versions
Short URL: https://ia.cr/2023/981
License: CC BY

BibTeX

@misc{cryptoeprint:2023/981,
      author = {Nigel P. Smart},
      title = {Practical and Efficient {FHE}-based {MPC}},
      howpublished = {Cryptology {ePrint} Archive, Paper 2023/981},
      year = {2023},
      url = {https://eprint.iacr.org/2023/981}
}