Published June 26, 2023
| Version v1
Conference paper
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Practical Multi-Key Homomorphic Encryption for More Flexible and Efficient Secure Federated Average Aggregation
Authors/Creators
- 1. atlanTTic Research Center, Universidade de Vigo
- 2. CEA-List, Université Paris-Saclay
Description
In this work, we introduce a lightweight communication-efficient multi-key approach suitable for the Federated Averaging rule. By combining secret-key RLWEbased HE, additive secret sharing and PRFs, we reduce approximately by a half the communication cost per party when compared to the usual public-key instantiations, while keeping practical homomorphic aggregation performances. Additionally, for LWE-based instantiations, our approach reduces the communication cost per party from quadratic to linear in terms of the lattice dimension.