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Federated self-supervised learning (FSSL) combines the advantages of decentralized modeling and unlabeled representation learning, serving as a cutting-edge paradigm with strong potential for scalability and privacy preservation. Although…

Cryptography and Security · Computer Science 2025-08-12 Jiayao Wang , Yang Song , Zhendong Zhao , Jiale Zhang , Qilin Wu , Junwu Zhu , Dongfang Zhao

The distributed nature of training makes Federated Learning (FL) vulnerable to backdoor attacks, where malicious model updates aim to compromise the global model's performance on specific tasks. Existing defense methods show limited…

Machine Learning · Computer Science 2025-03-20 Jiahao Xu , Zikai Zhang , Rui Hu

Federated learning enables machine learning algorithms to be trained over a network of multiple decentralized edge devices without requiring the exchange of local datasets. Successfully deploying federated learning requires ensuring that…

Machine Learning · Computer Science 2021-10-27 Meng Zhang , Ermin Wei , Randall Berry

Federated learning allows for clients in a distributed system to jointly train a machine learning model. However, clients' models are vulnerable to attacks during the training and testing phases. In this paper, we address the issue of…

Machine Learning · Computer Science 2023-10-24 Taejin Kim , Shubhranshu Singh , Nikhil Madaan , Carlee Joe-Wong

Backdoor attacks aim to inject a backdoor into a classifier such that it predicts any input with an attacker-chosen backdoor trigger as an attacker-chosen target class. Existing backdoor attacks require either retraining the classifier with…

Cryptography and Security · Computer Science 2024-12-10 Bochuan Cao , Jinyuan Jia , Chuxuan Hu , Wenbo Guo , Zhen Xiang , Jinghui Chen , Bo Li , Dawn Song

Federated learning is a distributed framework designed to address privacy concerns. However, it introduces new attack surfaces, which are especially prone when data is non-Independently and Identically Distributed. Existing approaches fail…

Cryptography and Security · Computer Science 2025-05-27 Hyejun Jeong , Hamin Son , Seohu Lee , Jayun Hyun , Tai-Myoung Chung

Federated learning (FL) aims to collaboratively train a shared model across multiple clients without transmitting their local data. Data heterogeneity is a critical challenge in realistic FL settings, as it causes significant performance…

Machine Learning · Computer Science 2023-11-15 Yuwei Wang , Runhan Li , Hao Tan , Xuefeng Jiang , Sheng Sun , Min Liu , Bo Gao , Zhiyuan Wu

Backdoor attacks can cause reinforcement learning (RL) policies to behave normally under clean inputs while executing malicious behaviors when triggers are present. Existing RL backdoor attacks are primarily studied in simulation and often…

Robotics · Computer Science 2026-05-14 Tairan Huang , Qingqing Ye , Yulin Jin , Jiawei Lian , Yaxin Xiao , Yi Wang , Haibo Hu

The foundation models (FMs) have been used to generate synthetic public datasets for the heterogeneous federated learning (HFL) problem where each client uses a unique model architecture. However, the vulnerabilities of integrating FMs,…

Distributed, Parallel, and Cluster Computing · Computer Science 2023-12-01 Xi Li , Chen Wu , Jiaqi Wang

Recent research efforts indicate that federated learning (FL) systems are vulnerable to a variety of security breaches. While numerous defense strategies have been suggested, they are mainly designed to counter specific attack patterns and…

Cryptography and Security · Computer Science 2025-12-19 Henger Li , Tianyi Xu , Tao Li , Yunian Pan , Quanyan Zhu , Zizhan Zheng

In this work, besides improving prediction accuracy, we study whether personalization could bring robustness benefits to backdoor attacks. We conduct the first study of backdoor attacks in the pFL framework, testing 4 widely used backdoor…

Machine Learning · Computer Science 2023-06-06 Zeyu Qin , Liuyi Yao , Daoyuan Chen , Yaliang Li , Bolin Ding , Minhao Cheng

Federated Learning (FL) enables collaborative model training across multiple clients without sharing private data. We consider FL scenarios wherein FL clients are subject to adversarial (Byzantine) attacks, while the FL server is trusted…

Machine Learning · Computer Science 2026-04-30 Emmanouil Kritharakis , Dusan Jakovetic , Antonios Makris , Konstantinos Tserpes

Federated learning (FL) is a distributed learning process that uses a trusted aggregation server to allow multiple parties (or clients) to collaboratively train a machine learning model without having them share their private data. Recent…

Cryptography and Security · Computer Science 2023-10-04 Jorge Castillo , Phillip Rieger , Hossein Fereidooni , Qian Chen , Ahmad Sadeghi

Personalized Federated Learning (PFL) aims to learn personalized models for each client based on the knowledge across all clients in a privacy-preserving manner. Existing PFL methods generally assume that the underlying global data across…

Machine Learning · Computer Science 2023-03-28 Yang Lu , Pinxin Qian , Gang Huang , Hanzi Wang

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

As a distributed machine learning paradigm, Federated Learning (FL) enables large-scale clients to collaboratively train a model without sharing their raw data. However, due to the lack of data auditing for untrusted clients, FL is…

Machine Learning · Computer Science 2025-09-10 Yanxin Yang , Ming Hu , Xiaofei Xie , Yue Cao , Pengyu Zhang , Yihao Huang , Mingsong Chen

Prototype-based federated learning (PFL) has emerged as a promising paradigm to address data heterogeneity problems in federated learning, as it leverages mean feature vectors as prototypes to enhance model generalization. However, its…

Machine Learning · Computer Science 2025-09-17 Honghong Zeng , Jiong Lou , Zhe Wang , Hefeng Zhou , Chentao Wu , Wei Zhao , Jie Li

Traditional backdoor attacks in federated learning (FL) operate within constrained attack scenarios, as they depend on visible triggers and require physical modifications to the target object, which limits their practicality. To address…

Machine Learning · Computer Science 2025-09-17 Jiahao Xu , Zikai Zhang , Rui Hu

Federated learning (FL) has shown great potential in medical image computing since it provides a decentralized learning paradigm that allows multiple clients to train a model collaboratively without privacy leakage. However, current studies…

Computer Vision and Pattern Recognition · Computer Science 2025-02-25 Meilu Zhu , Qiushi Yang , Zhifan Gao , Yixuan Yuan , Jun Liu

The main premise of federated learning (FL) is that machine learning model updates are computed locally to preserve user data privacy. This approach avoids by design user data to ever leave the perimeter of their device. Once the updates…

Machine Learning · Computer Science 2023-09-15 Simon Queyrut , Valerio Schiavoni , Pascal Felber