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Federated learning (FL) enables a collaborative environment for training machine learning models without sharing training data between users. This is typically achieved by aggregating model gradients on a central server. Decentralized…

Machine Learning · Computer Science 2024-07-09 Siddhartha Bhattacharya , Daniel Helo , Joshua Siegel

Federated Learning (FL) enables collaborative model training across multiple clients while preserving data privacy by keeping local datasets on-device. In this work, we address FL settings where clients may behave adversarially, exhibiting…

Machine Learning · Computer Science 2025-08-26 Emmanouil Kritharakis , Antonios Makris , Dusan Jakovetic , Konstantinos Tserpes

In federated learning, multiple client devices jointly learn a machine learning model: each client device maintains a local model for its local training dataset, while a master device maintains a global model via aggregating the local…

Cryptography and Security · Computer Science 2021-11-23 Minghong Fang , Xiaoyu Cao , Jinyuan Jia , Neil Zhenqiang Gong

This paper presents a comprehensive survey of Federated Reinforcement Learning (FRL), an emerging and promising field in Reinforcement Learning (RL). Starting with a tutorial of Federated Learning (FL) and RL, we then focus on the…

Machine Learning · Computer Science 2023-05-12 Jiaju Qi , Qihao Zhou , Lei Lei , Kan Zheng

Federated learning enables training collaborative machine learning models at scale with many participants whilst preserving the privacy of their datasets. Standard federated learning techniques are vulnerable to Byzantine failures, biased…

Machine Learning · Statistics 2019-09-12 Luis Muñoz-González , Kenneth T. Co , Emil C. Lupu

Federated learning is a prominent framework that enables clients (e.g., mobile devices or organizations) to train a collaboratively global model under a central server's orchestration while keeping local training datasets' privacy. However,…

Machine Learning · Computer Science 2021-07-20 Farnaz Tahmasebian , Jian Lou , Li Xiong

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 Learning (FL) enables multiple clients to collaboratively train models without sharing raw data, but it is highly vulnerable to Byzantine attacks. Existing robust approaches can neutralize these threats but incur substantial…

Machine Learning · Computer Science 2026-05-28 Shiyuan Zuo , Jiashuo Li , Rongfei Fan , Han Hu , Jie Xu

Byzantine-robust federated learning aims to enable a service provider to learn an accurate global model when a bounded number of clients are malicious. The key idea of existing Byzantine-robust federated learning methods is that the service…

Cryptography and Security · Computer Science 2022-04-13 Xiaoyu Cao , Minghong Fang , Jia Liu , Neil Zhenqiang Gong

Federated learning (FL) is an emerging distributed learning paradigm without sharing participating clients' private data. However, existing works show that FL is vulnerable to both Byzantine (security) attacks and data reconstruction…

Cryptography and Security · Computer Science 2024-07-30 Chenfei Nie , Qiang Li , Yuxin Yang , Yuede Ji , Binghui Wang

Federated learning (FL) is designed to preserve data privacy during model training, where the data remains on the client side (i.e., IoT devices), and only model updates of clients are shared iteratively for collaborative learning. However,…

Machine Learning · Computer Science 2023-09-08 Zikai Zhang , Rui Hu

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

Due to its distributed nature, federated learning is vulnerable to poisoning attacks, in which malicious clients poison the training process via manipulating their local training data and/or local model updates sent to the cloud server,…

Cryptography and Security · Computer Science 2022-10-05 Xiaoyu Cao , Zaixi Zhang , Jinyuan Jia , Neil Zhenqiang Gong

The increasing popularity of the federated learning (FL) framework due to its success in a wide range of collaborative learning tasks also induces certain security concerns. Among many vulnerabilities, the risk of Byzantine attacks is of…

Machine Learning · Computer Science 2024-01-02 Kerem Ozfatura , Emre Ozfatura , Alptekin Kupcu , Deniz Gunduz

Federated learning enables clients to collaboratively learn a shared global model without sharing their local training data with a cloud server. However, malicious clients can corrupt the global model to predict incorrect labels for testing…

Cryptography and Security · Computer Science 2021-10-28 Xiaoyu Cao , Jinyuan Jia , Neil Zhenqiang Gong

Federated learning systems that jointly preserve Byzantine robustness and privacy have remained an open problem. Robust aggregation, the standard defense for Byzantine attacks, generally requires server access to individual updates or…

Cryptography and Security · Computer Science 2021-10-07 Raj Kiriti Velicheti , Derek Xia , Oluwasanmi Koyejo

Federated learning (FL) allows distributed participants to train machine learning models in a decentralized manner. It can be used for radio signal classification with multiple receivers due to its benefits in terms of privacy and…

Signal Processing · Electrical Eng. & Systems 2024-01-23 Han Zhang , Medhat Elsayed , Majid Bavand , Raimundas Gaigalas , Yigit Ozcan , Melike Erol-Kantarci

This paper investigates the robustness of over-the-air federated learning to Byzantine attacks. The simple averaging of the model updates via over-the-air computation makes the learning task vulnerable to random or intended modifications of…

Machine Learning · Computer Science 2022-06-24 Houssem Sifaou , Geoffrey Ye Li

The rapid development of artificial intelligence systems has amplified societal concerns regarding their usage, necessitating regulatory frameworks that encompass data privacy. Federated Learning (FL) is posed as potential solution to data…

Machine Learning · Computer Science 2025-03-28 Mario García-Márquez , Nuria Rodríguez-Barroso , M. Victoria Luzón , Francisco Herrera

To preserve user privacy in recommender systems, federated recommendation (FR) based on federated learning (FL) emerges, keeping the personal data on the local client and updating a model collaboratively. Unlike FL, FR has a unique sparse…

Cryptography and Security · Computer Science 2025-01-09 Zhongjian Zhang , Mengmei Zhang , Xiao Wang , Lingjuan Lyu , Bo Yan , Junping Du , Chuan Shi