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Current backdoor attacks against federated learning (FL) strongly rely on universal triggers or semantic patterns, which can be easily detected and filtered by certain defense mechanisms such as norm clipping, comparing parameter…

Machine Learning · Computer Science 2023-10-02 Yanqi Qiao , Dazhuang Liu , Congwen Chen , Rui Wang , Kaitai Liang

Federated learning (FL) has been demonstrated to be susceptible to backdoor attacks. However, existing academic studies on FL backdoor attacks rely on a high proportion of real clients with main task-related data, which is impractical. In…

Cryptography and Security · Computer Science 2024-05-07 Minghui Li , Wei Wan , Yuxuan Ning , Shengshan Hu , Lulu Xue , Leo Yu Zhang , Yichen Wang

Federated learning has seen increased adoption in recent years in response to the growing regulatory demand for data privacy. However, the opaque local training process of federated learning also sparks rising concerns about model…

Artificial Intelligence · Computer Science 2023-08-24 Yuxi Mi , Yiheng Sun , Jihong Guan , Shuigeng Zhou

Federated graph learning (FedGL) is an emerging federated learning (FL) framework that extends FL to learn graph data from diverse sources. FL for non-graph data has shown to be vulnerable to backdoor attacks, which inject a shared backdoor…

Cryptography and Security · Computer Science 2024-07-15 Yuxin Yang , Qiang Li , Jinyuan Jia , Yuan Hong , Binghui Wang

Existing research primarily focuses on backdoor attacks and defenses within the generic federated learning scenario, where all clients collaborate to train a single global model. A recent study conducted by Qin et al. (2023) marks the…

Cryptography and Security · Computer Science 2024-04-09 Tiandi Ye , Cen Chen , Yinggui Wang , Xiang Li , Ming Gao

Federated Contrastive Learning (FCL) is an emerging privacy-preserving paradigm in distributed learning for unlabeled data. In FCL, distributed parties collaboratively learn a global encoder with unlabeled data, and the global encoder could…

Cryptography and Security · Computer Science 2023-11-29 Yao Huang , Kongyang Chen , Jiannong Cao , Jiaxing Shen , Shaowei Wang , Yun Peng , Weilong Peng , Kechao Cai

Recent studies have shown that federated learning (FL) is vulnerable to poisoning attacks that inject a backdoor into the global model. These attacks are effective even when performed by a single client, and undetectable by most existing…

Cryptography and Security · Computer Science 2021-04-20 Sebastien Andreina , Giorgia Azzurra Marson , Helen Möllering , Ghassan Karame

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

Large models adaptation through Federated Learning (FL) addresses a wide range of use cases and is enabled by Parameter-Efficient Fine-Tuning techniques such as Low-Rank Adaptation (LoRA). However, this distributed learning paradigm faces…

Machine Learning · Computer Science 2026-02-19 Bastien Vuillod , Pierre-Alain Moellic , Jean-Max Dutertre

Federated learning (FL) systems allow decentralized data-owning clients to jointly train a global model through uploading their locally trained updates to a centralized server. The property of decentralization enables adversaries to craft…

Cryptography and Security · Computer Science 2025-04-23 Yanbo Dai , Songze Li , Zihan Gan , Xueluan Gong

Due to the distributed nature of Federated Learning (FL), researchers have uncovered that FL is vulnerable to backdoor attacks, which aim at injecting a sub-task into the FL without corrupting the performance of the main task. Single-shot…

Artificial Intelligence · Computer Science 2022-07-26 Tian Liu , Xueyang Hu , Tao Shu

Federated Learning (FL) is a collaborative machine learning technique where multiple clients work together with a central server to train a global model without sharing their private data. However, the distribution shift across non-IID…

Machine Learning · Computer Science 2024-06-11 Xiaoting Lyu , Yufei Han , Wei Wang , Jingkai Liu , Yongsheng Zhu , Guangquan Xu , Jiqiang Liu , Xiangliang Zhang

Federated learning security research has predominantly focused on backdoor threats from a minority of malicious clients that intentionally corrupt model updates. This paper challenges this paradigm by investigating a more pervasive and…

Cryptography and Security · Computer Science 2026-02-18 Haodong Zhao , Jinming Hu , Gongshen Liu

Federated learning enables thousands of participants to construct a deep learning model without sharing their private training data with each other. For example, multiple smartphones can jointly train a next-word predictor for keyboards…

Cryptography and Security · Computer Science 2019-08-07 Eugene Bagdasaryan , Andreas Veit , Yiqing Hua , Deborah Estrin , Vitaly Shmatikov

Edge devices in federated learning usually have much more limited computation and communication resources compared to servers in a data center. Recently, advanced model compression methods, like the Lottery Ticket Hypothesis, have already…

Machine Learning · Computer Science 2021-09-23 Zeyuan Yin , Ye Yuan , Panfeng Guo , Pan Zhou

Federated Learning (FL) is a privacy-preserving distributed machine learning technique that enables individual clients (e.g., user participants, edge devices, or organizations) to train a model on their local data in a secure environment…

Cryptography and Security · Computer Science 2024-02-26 Waris Gill , Ali Anwar , Muhammad Ali Gulzar

Federated learning (FL), which aims to facilitate data collaboration across multiple organizations without exposing data privacy, encounters potential security risks. One serious threat is backdoor attacks, where an attacker injects a…

Cryptography and Security · Computer Science 2023-06-21 Yuexin Xuan , Xiaojun Chen , Zhendong Zhao , Bisheng Tang , Ye Dong

Federated Learning (FL) enables collaborative model training while preserving data privacy, but it is highly vulnerable to backdoor attacks. Most existing defense methods in FL have limited effectiveness due to their neglect of the model's…

Cryptography and Security · Computer Science 2025-08-05 Xinhai Yan , Libing Wu , Zhuangzhuang Zhang , Bingyi Liu , Lijuan Huo , Jing Wang

Federated Learning enables entities to collaboratively learn a shared prediction model while keeping their training data locally. It prevents data collection and aggregation and, therefore, mitigates the associated privacy risks. However,…

Cryptography and Security · Computer Science 2020-10-16 Raouf Kerkouche , Gergely Ács , Claude Castelluccia

Federated Learning (FL) is a popular paradigm enabling clients to jointly train a global model without sharing raw data. However, FL is known to be vulnerable towards backdoor attacks due to its distributed nature. As participants,…

Cryptography and Security · Computer Science 2025-04-01 Xingyu Lyu , Ning Wang , Yang Xiao , Shixiong Li , Tao Li , Danjue Chen , Yimin Chen