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Malicious clients can attack federated learning systems using malicious data, including backdoor samples, during the training phase. The compromised global model will perform well on the validation dataset designed for the task, but a small…

Cryptography and Security · Computer Science 2021-01-18 Chen Wu , Xian Yang , Sencun Zhu , Prasenjit Mitra

Federated learning is known for its capability to safeguard the participants' data privacy. However, recently emerged model inversion attacks (MIAs) have shown that a malicious parameter server can reconstruct individual users' local data…

Machine Learning · Computer Science 2024-12-02 Shanghao Shi , Ning Wang , Yang Xiao , Chaoyu Zhang , Yi Shi , Y. Thomas Hou , Wenjing Lou

Federated Learning (FL) is a promising approach for training machine learning models on decentralized data while preserving privacy. However, privacy risks, particularly Membership Inference Attacks (MIAs), which aim to determine whether a…

Machine Learning · Computer Science 2025-03-28 Gongxi Zhu , Donghao Li , Hanlin Gu , Yuan Yao , Lixin Fan , Yuxing Han

Recent advances in machine learning show that neural models are vulnerable to minimally perturbed inputs, or adversarial examples. Adversarial algorithms are optimization problems that minimize the accuracy of ML models by perturbing…

Machine Learning · Computer Science 2022-05-20 Thomas Cilloni , Charles Walter , Charles Fleming

In this brief, we show that sequentially learning new information presented to a continual (incremental) learning model introduces new security risks: an intelligent adversary can introduce small amount of misinformation to the model during…

Machine Learning · Computer Science 2022-02-10 Muhammad Umer , Robi Polikar

Federated learning (FL) is a privacy preserving machine learning paradigm designed to collaboratively learn a global model without data leakage. Specifically, in a typical FL system, the central server solely functions as an coordinator to…

Machine Learning · Computer Science 2024-12-17 Hangyu Zhu , Yuxiang Fan , Zhenping Xie

Federated learning (FL) is a privacy-preserving machine learning technique that facilitates collaboration among participants across demographics. FL enables model sharing, while restricting the movement of data. Since FL provides…

Machine Learning · Computer Science 2025-10-15 Harsh Kasyap , Minghong Fang , Zhuqing Liu , Carsten Maple , Somanath Tripathy

Federated Learning remains highly susceptible to backdoor attacks--malicious clients inject targeted behaviours into the global model. Existing defenses suffer from substantial false-positive rates under realistic non-independent and…

Cryptography and Security · Computer Science 2026-05-13 Fatima Z. Abacha , Sin G. Teo , Yuanxiang Wu , Lucas C. Cordeiro , Mustafa A. Mustafa

Motivated by the ever-increasing concerns on personal data privacy and the rapidly growing data volume at local clients, federated learning (FL) has emerged as a new machine learning setting. An FL system is comprised of a central parameter…

Cryptography and Security · Computer Science 2022-08-04 Xiang Ma , Haijian Sun , Rose Qingyang Hu , Yi Qian

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

Federated learning (FL) has become an emerging machine learning technique lately due to its efficacy in safeguarding the client's confidential information. Nevertheless, despite the inherent and additional privacy-preserving mechanisms…

Cryptography and Security · Computer Science 2021-09-22 Md Tamjid Hossain , Shafkat Islam , Shahriar Badsha , Haoting Shen

Federated Learning (FL) is a paradigm in Machine Learning (ML) that addresses data privacy, security, access rights and access to heterogeneous information issues by training a global model using distributed nodes. Despite its advantages,…

Cryptography and Security · Computer Science 2022-01-19 Ranwa Al Mallah , David Lopez , Godwin Badu Marfo , Bilal Farooq

Backdoor attack has emerged as a major security threat to deep neural networks (DNNs). While existing defense methods have demonstrated promising results on detecting or erasing backdoors, it is still not clear whether robust training…

Machine Learning · Computer Science 2021-12-02 Yige Li , Xixiang Lyu , Nodens Koren , Lingjuan Lyu , Bo Li , Xingjun Ma

Federated learning is a decentralized machine learning approach where clients train models locally and share model updates to develop a global model. This enables low-resource devices to collaboratively build a high-quality model without…

Cryptography and Security · Computer Science 2024-12-10 Li Bai , Haibo Hu , Qingqing Ye , Haoyang Li , Leixia Wang , Jianliang Xu

Federated learning (FL) has recently emerged as a promising distributed machine learning (ML) paradigm. Practical needs of the "right to be forgotten" and countering data poisoning attacks call for efficient techniques that can remove, or…

Machine Learning · Computer Science 2021-05-07 Gaoyang Liu , Xiaoqiang Ma , Yang Yang , Chen Wang , Jiangchuan Liu

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) facilitates collaborative model training among multiple clients without raw data exposure. However, recent studies have shown that clients' private training data can be reconstructed from shared gradients in FL, a…

Cryptography and Security · Computer Science 2025-02-06 Jiacheng Du , Jiahui Hu , Zhibo Wang , Peng Sun , Neil Zhenqiang Gong , Kui Ren , Chun Chen

Privacy concerns associated with machine learning models have driven research into machine unlearning, which aims to erase the memory of specific target training data from already trained models. This issue also arises in federated…

Machine Learning · Computer Science 2025-03-14 Yuyuan Li , Jiaming Zhang , Yixiu Liu , Chaochao Chen

Federated Learning (FL) protects data privacy while providing a decentralized method for training models. However, because of the distributed schema, it is susceptible to adversarial clients that could alter results or sabotage model…

Cryptography and Security · Computer Science 2025-06-23 Likhitha Annapurna Kavuri , Akshay Mhatre , Akarsh K Nair , Deepti Gupta

Fast identification of new network attack patterns is crucial for improving network security. Nevertheless, identifying an ongoing attack in a heterogeneous network is a non-trivial task. Federated learning emerges as a solution to…

Cryptography and Security · Computer Science 2022-05-25 Helio N. Cunha Neto , Ivana Dusparic , Diogo M. F. Mattos , Natalia C. Fernandes