Secure Aggregation Protocol Based on DC-Nets and Secret Sharing for Decentralized Federated Learning

Author:

Pereira Diogo1ORCID,Reis Paulo Ricardo1ORCID,Borges Fábio1ORCID

Affiliation:

1. National Laboratory for Scientific Computing, Petrópolis 25651-075, RJ, Brazil

Abstract

In the era of big data, millions and millions of data are generated every second by different types of devices. Training machine-learning models with these data has become increasingly common. However, the data used for training are often sensitive and may contain information such as medical, banking, or consumer records, for example. These data can cause problems in people’s lives if they are leaked and also incur sanctions for companies that leak personal information for any reason. In this context, Federated Learning emerges as a solution to the privacy of personal data. However, even when only the gradients of the local models are shared with the central server, some attacks can reconstruct user data, allowing a malicious server to violate the FL principle, which is to ensure the privacy of local data. We propose a secure aggregation protocol for Decentralized Federated Learning, which does not require a central server to orchestrate the aggregation process. To achieve this, we combined a Multi-Secret-Sharing scheme with a Dining Cryptographers Network. We validate the proposed protocol in simulations using the MNIST handwritten digits dataset. This protocol achieves results comparable to Federated Learning with the FedAvg protocol while adding a layer of privacy to the models. Furthermore, it obtains a timing performance that does not significantly affect the total training time, unlike protocols that use Homomorphic Encryption.

Funder

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil

National Laboratory for Scientific Computing—Brasil

Publisher

MDPI AG

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