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While machine learning is going through an era of celebrated success, concerns have been raised about the vulnerability of its backbone: stochastic gradient descent (SGD). Recent approaches have been proposed to ensure the robustness of…

Machine Learning · Statistics 2018-07-19 El Mahdi El Mhamdi , Rachid Guerraoui , Sébastien Rouault

Federated Learning (FL) paradigms enable large numbers of clients to collaboratively train Machine Learning models on private data. However, due to their multi-party nature, traditional FL schemes are left vulnerable to Byzantine attacks…

Machine Learning · Computer Science 2024-10-31 Atharv Deshmukh

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

Federated recommendation systems can provide good performance without collecting users' private data, making them attractive. However, they are susceptible to low-cost poisoning attacks that can degrade their performance. In this paper, we…

Machine Learning · Computer Science 2020-06-16 Chen Chen , Jingfeng Zhang , Anthony K. H. Tung , Mohan Kankanhalli , Gang Chen

Gradient-based training in federated learning is known to be vulnerable to faulty/malicious clients, which are often modeled as Byzantine clients. To this end, previous work either makes use of auxiliary data at parameter server to verify…

Machine Learning · Computer Science 2023-05-02 Jian Xu , Shao-Lun Huang , Linqi Song , Tian Lan

Federated learning has arisen as a mechanism to allow multiple participants to collaboratively train a model without sharing their data. In these settings, participants (workers) may not trust each other fully; for instance, a set of…

Machine Learning · Computer Science 2021-07-28 Kamala Varma , Yi Zhou , Nathalie Baracaldo , Ali Anwar

We study the problem of Byzantine fault tolerance in a distributed optimization setting, where there is a group of $N$ agents communicating with a trusted centralized coordinator. Among these agents, there is a subset of $f$ agents that may…

Optimization and Control · Mathematics 2023-12-19 Amit Dutta , Thinh T. Doan , Jeffrey H. Reed

We study a recently proposed large-scale distributed learning paradigm, namely Federated Learning, where the worker machines are end users' own devices. Statistical and computational challenges arise in Federated Learning particularly in…

Machine Learning · Computer Science 2019-10-11 Avishek Ghosh , Justin Hong , Dong Yin , Kannan Ramchandran

Federated learning (FL) becomes vulnerable to Byzantine attacks where some of participators tend to damage the utility or discourage the convergence of the learned model via sending their malicious model updates. Previous works propose to…

Cryptography and Security · Computer Science 2024-08-13 Fangyuan Zhao , Yuexiang Xie , Xuebin Ren , Bolin Ding , Shusen Yang , Yaliang Li

Federated Learning (FL) enables multiple distributed clients (e.g., mobile devices) to collaboratively train a centralized model while keeping the training data locally on the client. Compared to traditional centralized machine learning, FL…

Machine Learning · Computer Science 2021-09-29 Zhuohang Li , Luyang Liu , Jiaxin Zhang , Jian Liu

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

Ensuring resilience to Byzantine clients while maintaining the privacy of the clients' data is a fundamental challenge in federated learning (FL). When the clients' data is homogeneous, suitable countermeasures were studied from an…

Machine Learning · Computer Science 2025-06-12 Maximilian Egger , Rawad Bitar

In this paper, we study a linear bandit optimization problem in a federated setting where a large collection of distributed agents collaboratively learn a common linear bandit model. Standard federated learning algorithms applied to this…

Machine Learning · Computer Science 2022-04-05 Ali Jadbabaie , Haochuan Li , Jian Qian , Yi Tian

This work considers two related learning problems in a federated attack prone setting: federated principal components analysis (PCA) and federated low rank column-wise sensing (LRCS). The node attacks are assumed to be Byzantine which means…

Information Theory · Computer Science 2024-08-12 Ankit Pratap Singh , Namrata Vaswani

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

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

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

Federated learning is a distributed training framework vulnerable to Byzantine attacks, particularly when over 50% of clients are malicious or when datasets are highly non-independent and identically distributed (non-IID). Additionally,…

Cryptography and Security · Computer Science 2025-08-04 Haocheng Jiang , Hua Shen , Jixin Zhang , Willy Susilo , Mingwu Zhang

Federated learning (FL) is an emerging machine learning paradigm, in which clients jointly learn a model with the help of a cloud server. A fundamental challenge of FL is that the clients are often heterogeneous, e.g., they have different…

Cryptography and Security · Computer Science 2022-12-14 Minghong Fang , Jia Liu , Neil Zhenqiang Gong , Elizabeth S. Bentley

Federated learning (FL) allows multiple clients to collaboratively train a global machine learning model through a server, without exchanging their private training data. However, the decentralized aspect of FL makes it susceptible to…

Cryptography and Security · Computer Science 2025-01-30 Minghong Fang , Seyedsina Nabavirazavi , Zhuqing Liu , Wei Sun , Sundararaja Sitharama Iyengar , Haibo Yang