Paper 2023/642
PELTA -- Shielding Multiparty-FHE against Malicious Adversaries
, École Polytechnique Fédérale de LausanneAbstract
Multiparty fully homomorphic encryption (MFHE) schemes enable multiple parties to efficiently compute functions on their sensitive data while retaining confidentiality. However, existing MFHE schemes guarantee data confidentiality and the correctness of the computation result only against honest-but-curious adversaries. In this work, we provide the first practical construction that enables the verification of MFHE operations in zero-knowledge, protecting MFHE from malicious adversaries. Our solution relies on a combination of lattice-based commitment schemes and proof systems which we adapt to support both modern FHE schemes and their implementation optimizations. We implement our construction in PELTA. Our experimental evaluation shows that PELTA is one to two orders of magnitude faster than existing techniques in the literature.
Metadata
- Available format(s)
-
PDF
- Category
- Cryptographic protocols
- Publication info
- Preprint.
- Keywords
- secure multiparty computationhomomorphic encryptionlattice-based cryptographyzero-knowledge proofs
- Contact author(s)
- sylvain chatel @ epfl ch
- History
- 2023-05-08: revised
- 2023-05-05: received
- See all versions
- Short URL
- https://ia.cr/2023/642
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2023/642,
author = {Sylvain Chatel and Christian Mouchet and Ali Utkan Sahin and Apostolos Pyrgelis and Carmela Troncoso and Jean-Pierre Hubaux},
title = {{PELTA} -- Shielding Multiparty-{FHE} against Malicious Adversaries},
howpublished = {Cryptology {ePrint} Archive, Paper 2023/642},
year = {2023},
url = {https://eprint.iacr.org/2023/642}
}
