A Selective Defense Strategy for Federated Learning Against Attacks

Federated Learning (FL) performs model training based on local training on clients and continuous model parameters interaction between terminals and server, which effectively solving data leakage and privacy risks in centralized machine learning models. However, since multiple malicious terminals participating in FL can achieve adversarial attacks by inputting small perturbations in the process of local learning, and then lead to incorrect results output by the global model. An effective federated defense strategy – SelectiveFL is proposed in this paper. This strategy first establishes a selective federated defense framework, and then updates the uploaded local model on the server on the basis of extracting attack characteristics through adversarial training at the terminals. At the same time, selective aggregation is carried out according to the attack characteristics, and finally multiple adaptive defense models can be obtained. Finally, the proposed defense method is evaluated on several representative benchmark datasets. The experimental results show that compared with the existing research work, the accuracy of the model can be improved by 2% to 11%. © 2024 Science Press. All rights reserved.