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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

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

Federated Learning (FL) enables clients to collaboratively train a global model using their local datasets while reinforcing data privacy, but it is prone to poisoning attacks. Existing defense mechanisms assume that clients' data are…

Cryptography and Security · Computer Science 2025-09-03 Mehdi Ben Ghali , Gouenou Coatrieux , Reda Bellafqira

Recent studies have revealed that federated learning (FL), once considered secure due to clients not sharing their private data with the server, is vulnerable to attacks such as client-side training data distribution inference, where a…

Cryptography and Security · Computer Science 2024-04-05 Yichang Xu , Ming Yin , Minghong Fang , Neil Zhenqiang Gong

In this paper, we propose BR-MTRL, a Byzantine-resilient multi-task representation learning framework that handles faulty or malicious agents. Our approach leverages representation learning through a shared neural network model, where all…

Machine Learning · Computer Science 2025-11-03 Tuan Le , Shana Moothedath

Federated learning (FL) is a promising solution to enable many AI applications, where sensitive datasets from distributed clients are needed for collaboratively training a global model. FL allows the clients to participate in the training…

Machine Learning · Computer Science 2022-05-09 Houssem Sifaou , Geoffrey Ye Li

Federated learning (FL) takes a first step towards privacy-preserving machine learning by training models while keeping client data local. Models trained using FL may still leak private client information through model updates during…

Machine Learning · Computer Science 2023-01-18 Nasser Aldaghri , Hessam Mahdavifar , Ahmad Beirami

This paper develops a comprehensive framework to address three critical trustworthy challenges in federated learning (FL): robustness against Byzantine attacks, fairness, and privacy preservation. To improve the system's defense against…

Machine Learning · Computer Science 2025-03-06 Alina Basharat , Yijun Bian , Ping Xu , Zhi Tian

Federated machine learning leverages edge computing to develop models from network user data, but privacy in federated learning remains a major challenge. Techniques using differential privacy have been proposed to address this, but bring…

Cryptography and Security · Computer Science 2021-12-14 Timothy Stevens , Christian Skalka , Christelle Vincent , John Ring , Samuel Clark , Joseph Near

The majority of work in privacy-preserving federated learning (FL) has been focusing on horizontally partitioned datasets where clients share the same sets of features and can train complete models independently. However, in many…

Machine Learning · Computer Science 2023-05-22 Xinchi Qiu , Heng Pan , Wanru Zhao , Chenyang Ma , Pedro Porto Buarque de Gusmão , Nicholas D. Lane

In this work, we propose FLVoogd, an updated federated learning method in which servers and clients collaboratively eliminate Byzantine attacks while preserving privacy. In particular, servers use automatic Density-based Spatial Clustering…

Cryptography and Security · Computer Science 2022-07-04 Yuhang Tian , Rui Wang , Yanqi Qiao , Emmanouil Panaousis , Kaitai Liang

Prior efforts in enhancing federated learning (FL) security fall into two categories. At one end of the spectrum, some work uses secure aggregation techniques to hide the individual client's updates and only reveal the aggregated global…

Distributed, Parallel, and Cluster Computing · Computer Science 2021-06-01 Lun Wang , Qi Pang , Shuai Wang , Dawn Song

Federated Learning (FL) has been proposed as a privacy-preserving solution for distributed machine learning, particularly in heterogeneous FL settings where clients have varying computational capabilities and thus train models with…

Machine Learning · Computer Science 2025-03-11 Gergely Dániel Németh , Miguel Ángel Lozano , Novi Quadrianto , Nuria Oliver

Federated Learning (FL) is an emerging distributed machine learning paradigm enabling multiple clients to train a global model collaboratively without sharing their raw data. While FL enhances data privacy by design, it remains vulnerable…

Federated learning (FL) is a popular distributed learning paradigm in machine learning, which enables multiple clients to collaboratively train models under the guidance of a server without exposing private client data. However, FL's…

Machine Learning · Computer Science 2026-05-01 Zehui Tang , Yuchen Liu , Feihu Huang

Federated learning (FL) facilitates distributed training across different IoT and edge devices, safeguarding the privacy of their data. The inherent distributed structure of FL introduces vulnerabilities, especially from adversarial devices…

Cryptography and Security · Computer Science 2023-11-13 Shenghui Li , Edith Ngai , Fanghua Ye , Li Ju , Tianru Zhang , Thiemo Voigt

Federated learning (FL) enables multiple clients to collaboratively train machine learning models without revealing their private training data. In conventional FL, the system follows the server-assisted architecture (server-assisted FL),…

Cryptography and Security · Computer Science 2024-07-16 Minghong Fang , Zifan Zhang , Hairi , Prashant Khanduri , Jia Liu , Songtao Lu , Yuchen Liu , Neil Gong

Secure federated learning enables collaborative model training across decentralized users while preserving data privacy. A key component is secure aggregation, which keeps individual updates hidden from both the server and users, while also…

Cryptography and Security · Computer Science 2025-07-22 Usayd Shahul , J. Harshan

Federated Learning (FL) enables collaborative model training across distributed medical institutions while preserving patient privacy, but remains vulnerable to Byzantine attacks and statistical heterogeneity. We present OptiGradTrust, a…

Machine Learning · Computer Science 2025-08-01 Mohammad Karami , Fatemeh Ghassemi , Hamed Kebriaei , Hamid Azadegan

Federated Learning (FL) has gained significant attention for its privacy-preserving capabilities, enabling distributed devices to collaboratively train a global model without sharing raw data. However, its distributed nature forces the…

Cryptography and Security · Computer Science 2025-09-03 Chaoyu Zhang , Heng Jin , Shanghao Shi , Hexuan Yu , Sydney Johns , Y. Thomas Hou , Wenjing Lou
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