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Authors: Thomas Schneider ; Hossein Yalame and Michael Yonli

Affiliation: ENCRYPTO Group, Technical University of Darmstadt, Darmstadt, Germany

Keyword(s): Secure Computation, Multi-Key Homomorphic Encryption.

Abstract: This paper presents Griffin, an extension of the mixed-scheme single-key homomorphic encryption framework Pegasus (Lu et al., IEEE S&P’21) to a Multi-Key Homomorphic Encryption (MKHE) scheme with applications to secure computation. MKHE is a generalized notion of Homomorphic Encryption (HE) that allows for operations on ciphertexts encrypted under different keys. However, an efficient approach to evaluate both polynomial and non-polynomial functions on encrypted data in MKHE has not yet been developed, hindering the deployment of HE to real-life applications. Griffin addresses this challenge by introducing a method for transforming between MKHE ciphertexts of different schemes. The practicality of Griffin is demonstrated through benchmarks with multiple applications, including the sorting of sixty four 45-bit fixed point numbers with a precision of 7 bits in 21 minutes, and evaluating arbitrary functions with a one-time setup communication of 1.4 GB per party and 2.34 MB per ciphertext. Moreover, Griffin could compute the maximum of two numbers in 3.2 seconds, a 2× improvement over existing MKHE approaches that rely on a single scheme. (More)

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Paper citation in several formats:
Schneider, T.; Yalame, H. and Yonli, M. (2023). Griffin: Towards Mixed Multi-Key Homomorphic Encryption. In Proceedings of the 20th International Conference on Security and Cryptography - SECRYPT; ISBN 978-989-758-666-8; ISSN 2184-7711, SciTePress, pages 147-158. DOI: 10.5220/0012090200003555

@conference{secrypt23,
author={Thomas Schneider. and Hossein Yalame. and Michael Yonli.},
title={Griffin: Towards Mixed Multi-Key Homomorphic Encryption},
booktitle={Proceedings of the 20th International Conference on Security and Cryptography - SECRYPT},
year={2023},
pages={147-158},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0012090200003555},
isbn={978-989-758-666-8},
issn={2184-7711},
}

TY - CONF

JO - Proceedings of the 20th International Conference on Security and Cryptography - SECRYPT
TI - Griffin: Towards Mixed Multi-Key Homomorphic Encryption
SN - 978-989-758-666-8
IS - 2184-7711
AU - Schneider, T.
AU - Yalame, H.
AU - Yonli, M.
PY - 2023
SP - 147
EP - 158
DO - 10.5220/0012090200003555
PB - SciTePress

- Science and Technology Publications, Lda.
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