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While being an effective framework of learning a shared model across multiple edge devices, federated learning (FL) is generally vulnerable to Byzantine attacks from adversarial edge devices. While existing works on FL mitigate such…

Machine Learning · Computer Science 2022-11-01 Youngjoon Lee , Sangwoo Park , Joonhyuk Kang

Federated reinforcement learning (FRL) allows agents to jointly learn a global decision-making policy under the guidance of a central server. While FRL has advantages, its decentralized design makes it prone to poisoning attacks. To…

Cryptography and Security · Computer Science 2025-02-13 Minghong Fang , Xilong Wang , Neil Zhenqiang Gong

The possibility of adversarial (a.k.a., {\em Byzantine}) clients makes federated learning (FL) prone to arbitrary manipulation. The natural approach to robustify FL against adversarial clients is to replace the simple averaging operation at…

Machine Learning · Computer Science 2024-06-11 Youssef Allouah , Sadegh Farhadkhani , Rachid GuerraouI , Nirupam Gupta , Rafael Pinot , Geovani Rizk , Sasha Voitovych

Federated Learning (FL) enables multiple clients to collaboratively train a model without sharing their local data. Yet the FL system is vulnerable to well-designed Byzantine attacks, which aim to disrupt the model training process by…

Machine Learning · Computer Science 2024-09-05 Jiahao Xu , Zikai Zhang , Rui Hu

Federated learning (FL) enables multiple participants to train a global machine learning model without sharing their private training data. Peer-to-peer (P2P) FL advances existing centralized FL paradigms by eliminating the server that…

Machine Learning · Computer Science 2024-01-12 Zhangchen Xu , Fengqing Jiang , Luyao Niu , Jinyuan Jia , Radha Poovendran

Federated learning (FL) enables multiple clients to collaboratively train an accurate global model while protecting clients' data privacy. However, FL is susceptible to Byzantine attacks from malicious participants. Although the problem has…

Cryptography and Security · Computer Science 2023-08-08 Wei Wan , Shengshan Hu , Jianrong Lu , Leo Yu Zhang , Hai Jin , Yuanyuan He

Federated Learning (FL) is becoming a popular paradigm for leveraging distributed data and preserving data privacy. However, due to the distributed characteristic, FL systems are vulnerable to Byzantine attacks that compromised clients…

Cryptography and Security · Computer Science 2024-07-19 Peishen Yan , Hao Wang , Tao Song , Yang Hua , Ruhui Ma , Ningxin Hu , Mohammad R. Haghighat , Haibing Guan

Federated learning (FL) is recognized as a key enabling technology to provide intelligent services for future wireless networks and industrial systems with delay and privacy guarantees. However, the performance of wireless FL can be…

Information Theory · Computer Science 2021-05-25 Shaoming Huang , Yong Zhou , Ting Wang , Yuanming Shi

Distributed Federated Learning (DFL) enables decentralized model training across large-scale systems without a central parameter server. However, DFL faces three critical challenges: privacy leakage from honest-but-curious neighbors, slow…

Machine Learning · Computer Science 2026-02-24 Nuocheng Yang , Sihua Wang , Zhaohui Yang , Mingzhe Chen , Changchuan Yin , Kaibin Huang

Federated Learning (FL) allows multiple participating clients to train machine learning models collaboratively while keeping their datasets local and only exchanging the gradient or model updates with a coordinating server. Existing FL…

Cryptography and Security · Computer Science 2024-12-17 Xiaolan Gu , Ming Li , Li Xiong

Byzantine-robust federated learning aims at mitigating Byzantine failures during the federated training process, where malicious participants may upload arbitrary local updates to the central server to degrade the performance of the global…

Machine Learning · Computer Science 2023-02-15 Shenghui Li , Edith C. -H. Ngai , Thiemo Voigt

Most existing Byzantine-robust federated learning (FL) methods suffer from slow and unstable convergence. Moreover, when handling a substantial proportion of colluded malicious clients, achieving robustness typically entails compromising…

Machine Learning · Computer Science 2026-04-17 He Yang , Dongyi Lv , Wei Xi , Song Ma , Hanlin Gu , Jizhong Zhao

Byzantine-robust Federated Learning (FL) aims to counter malicious clients and train an accurate global model while maintaining an extremely low attack success rate. Most existing systems, however, are only robust when most of the clients…

Cryptography and Security · Computer Science 2023-11-17 Rui Wang , Xingkai Wang , Huanhuan Chen , Jérémie Decouchant , Stjepan Picek , Nikolaos Laoutaris , Kaitai Liang

In Federated Reinforcement Learning (FRL), agents aim to collaboratively learn a common task, while each agent is acting in its local environment without exchanging raw trajectories. Existing approaches for FRL either (a) do not provide any…

Machine Learning · Computer Science 2024-01-09 Philip Jordan , Florian Grötschla , Flint Xiaofeng Fan , Roger Wattenhofer

We investigate robust federated learning, where a group of workers collaboratively train a shared model under the orchestration of a central server in the presence of Byzantine adversaries capable of arbitrary and potentially malicious…

Machine Learning · Computer Science 2025-11-05 Lihan Xu , Yanjie Dong , Gang Wang , Runhao Zeng , Xiaoyi Fan , Xiping Hu

Federated learning (FL) is a privacy-friendly type of machine learning where devices locally train a model on their private data and typically communicate model updates with a server. In decentralized FL (DFL), peers communicate model…

Distributed, Parallel, and Cluster Computing · Computer Science 2021-10-22 Joost Verbraeken , Martijn de Vos , Johan Pouwelse

Federated learning (FL) shows great promise in large scale machine learning, but brings new risks in terms of privacy and security. We propose ByITFL, a novel scheme for FL that provides resilience against Byzantine users while keeping the…

Information Theory · Computer Science 2025-06-16 Yue Xia , Christoph Hofmeister , Maximilian Egger , Rawad Bitar

Federated Learning (FL) enables collaborative model training without sharing raw data. However, shared local model updates remain vulnerable to inference and poisoning attacks. Secure aggregation schemes have been proposed to mitigate these…

Machine Learning · Computer Science 2026-02-27 Arnab Nath , Harsh Kasyap

This paper addresses federated learning (FL) in the context of malicious Byzantine attacks and data heterogeneity. We introduce a novel Robust Average Gradient Algorithm (RAGA), which uses the geometric median for aggregation and {allows…

Machine Learning · Computer Science 2025-09-30 Shiyuan Zuo , Xingrun Yan , Rongfei Fan , Han Hu , Hangguan Shan , Tony Q. S. Quek , Puning Zhao

Federated learning (FL) is a machine learning paradigm that enables multiple data holders to collaboratively train a machine learning model without sharing their training data with external parties. In this paradigm, workers locally update…

Machine Learning · Computer Science 2025-09-08 Johan Erbani , Sonia Ben Mokhtar , Pierre-Edouard Portier , Elod Egyed-Zsigmond , Diana Nurbakova