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Open Access

ARTICLE

FedE: Protecting Training Data of Federated Learning Based on Multi-Precision Functional Encryption

Weijia Liu1, Junwen Deng2, Hao Li3, Zhenyong Zhang3,*
1 Intelligent and Digital Operation Center, Guizhou Power Grid Co., Ltd., Guiyang, China
2 Guizhou Power Trading Center, Guiyang, China
3 State Key Laboratory of Public Big Data, College of Computer Science and Technology, Guizhou University, Guiyang, China
* Corresponding Author: Zhenyong Zhang. Email: email

Computers, Materials & Continua https://doi.org/10.32604/cmc.2026.086022

Received 22 May 2026; Accepted 27 July 2026; Published online 10 August 2026

Abstract

With the rapid development of artificial intelligence technologies in machine learning-as-a-service (MLaaS), deep learning-based intelligent models have demonstrated high value in applications such as trend prediction and risk assessment. However, MLaaS data are typically highly sensitive and contain private information. In cross-institutional collaborative modeling scenarios, different departments and local centers often hold partial, heterogeneous data resources on MLaaS platforms. Given data security, privacy, and compliance requirements, raw data are difficult to share directly, which makes it challenging to apply centralized model training methods. This paper proposes FedE, a multi-precision, multi-source, heterogeneous privacy-preserving federated learning training method based on functional encryption. By introducing a multi-precision joint-computation mechanism, this method enhances numerical adaptation during ciphertext computation. Besides, combined with differential privacy techniques, it prevents model parameter updates from easily compromising privacy in cross-institutional federated learning. Based on the federated learning training process, a secure training framework for sensitive MLaaS data is constructed. Finally, experiments demonstrate the security and efficiency of the proposed approach.

Keywords

Privacy protection; functional encryption; federated learning; MLaaS

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