Learning to Detect Malicious Clients for Robust Federated Learning
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Abstract (arXiv)
Federated learning systems are vulnerable to attacks from malicious clients. As the central server in the system cannot govern the behaviors of the clients, a rogue client may initiate an attack by sending malicious model updates to the server, so as to degrade the learning performance or enforce targeted model poisoning attacks (a.k.a. backdoor attacks). Therefore, timely detecting these malicious model updates and the underlying attackers becomes critically important. In this work, we propose a new framework for robust federated learning where the central server learns to detect and remove the malicious model updates using a powerful detection model, leading to targeted defense. We evaluate our solution in both image classification and sentiment analysis tasks with a variety of machine learning models. Experimental results show that our solution ensures robust federated learning that is resilient to both the Byzantine attacks and the targeted model poisoning attacks.
Key facts. Cited by 88 papers in the map (data through 14 Oct 2026). First posted on arXiv 1 Feb 2020.
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Citing papers per year: 2021: 14; 2022: 15; 2023: 19; 2024: 16; 2025: 20; 2026: 4.
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- 2023Heterogeneous Federated Learning: State-of-the-art and Research Challengescited by 161
- 2022FLDetector: Defending Federated Learning Against Model Poisoning Attacks via Detecting Malicious Clientscited by 125
- 2022Neurotoxin: Durable Backdoors in Federated Learningcited by 98
- 2022Survey on Federated Learning Threats: concepts, taxonomy on attacks and defences, experimental study and challengescited by 84
- 2022DeepSight: Mitigating Backdoor Attacks in Federated Learning Through Deep Model Inspectioncited by 81
- 2023A Survey on Federated Unlearning: Challenges, Methods, and Future Directionscited by 63
- 2022FedRecover: Recovering from Poisoning Attacks in Federated Learning using Historical Informationcited by 58
- 2022FLIP: A Provable Defense Framework for Backdoor Mitigation in Federated Learningcited by 37
- 2023Backdoor Attacks and Defenses in Federated Learning: Survey, Challenges and Future Research Directionscited by 33
- 2022LoMar: A Local Defense Against Poisoning Attack on Federated Learningcited by 31
- 2023Integration of Large Language Models and Federated Learningcited by 31
- 2024Decentralized Federated Learning: A Survey on Security and Privacycited by 25
38 more
- 2023A Survey of Trustworthy Federated Learning with Perspectives on Security, Robustness, and Privacycited by 24
- 2023BayBFed: Bayesian Backdoor Defense for Federated Learningcited by 23
- 2023Multi-metrics adaptively identifies backdoors in Federated learningcited by 23
- 2023Data and Model Poisoning Backdoor Attacks on Wireless Federated Learning, and the Defense Mechanisms: A Comprehensive Surveycited by 18
- 2024Certified Robustness to Data Poisoning in Gradient-Based Trainingcited by 18
- 2021Robust Federated Learning with Attack-Adaptive Aggregationcited by 17
- 2021A Decentralized Federated Learning Framework via Committee Mechanism with Convergence Guaranteecited by 16
- 2023FedGT: Identification of Malicious Clients in Federated Learning with Secure Aggregationcited by 16
- 2021FedCCEA : A Practical Approach of Client Contribution Evaluation for Federated Learningcited by 14
- 2023Defenses in Adversarial Machine Learning: A Surveycited by 14
- 2021Auto-weighted Robust Federated Learning with Corrupted Data Sourcescited by 12
- 2022Multi-Task Distributed Learning using Vision Transformer with Random Patch Permutationcited by 10
- 2023FLrce: Resource-Efficient Federated Learning with Early-Stopping Strategycited by 10
- 2021Byzantine-robust Federated Learning through Spatial-temporal Analysis of Local Model Updatescited by 8
- 2021Federated Learning for Privacy-Preserving Open Innovation Future on Digital Healthcited by 8
- 2022Long-Short History of Gradients is All You Need: Detecting Malicious and Unreliable Clients in Federated Learningcited by 7
- 2023When Federated Learning meets Watermarking: A Comprehensive Overview of Techniques for Intellectual Property Protectioncited by 7
- 2024Towards Efficient and Certified Recovery from Poisoning Attacks in Federated Learningcited by 7
- 2023Resisting Backdoor Attacks in Federated Learning via Bidirectional Elections and Individual Perspectivecited by 6
- 2025FedSV: Byzantine-Robust Federated Learning via Shapley Valuecited by 6
- 2022Hijack Vertical Federated Learning Models As One Partycited by 5
- 2024Fine-Tuning Personalization in Federated Learning to Mitigate Adversarial Clientscited by 5
- 2021Federated Learning: Issues in Medical Applicationcited by 4
- 2021Bristle: Decentralized Federated Learning in Byzantine, Non-i.i.d. Environmentscited by 4
- 2022Federated and Transfer Learning: A Survey on Adversaries and Defense Mechanismscited by 4
- 2023Backdoor Learning for NLP: Recent Advances, Challenges, and Future Research Directionscited by 4
- 2023Trustworthy Federated Learning: A Surveycited by 4
- 2024Communication-Efficient Byzantine-Resilient Federated Zero-Order Optimizationcited by 4
- 2026Exact Certification of Data-Poisoning Attacks Using Mixed-Integer Programmingcited by 4
- 2022Technical Report: Assisting Backdoor Federated Learning with Whole Population Knowledge Alignmentcited by 3
- 2023SPIRT: A Fault-Tolerant and Reliable Peer-to-Peer Serverless ML Training Architecturecited by 3
- 2024Fin-Fed-OD: Federated Outlier Detection on Financial Tabular Datacited by 3
- 2024BoBa: Boosting Backdoor Detection through Data Distribution Inference in Federated Learningcited by 3
- 2025FedEAT: A Robustness Optimization Framework for Federated LLMscited by 3
- 2025Don't Reach for the Stars: Rethinking Topology for Resilient Federated Learningcited by 3
- 2025Practical Framework for Privacy-Preserving and Byzantine-robust Federated Learningcited by 3
- 2021DID-eFed: Facilitating Federated Learning as a Service with Decentralized Identitiescited by 2
- 2021ABC-FL: Anomalous and Benign client Classification in Federated Learningcited by 2
50 most cited of 88 All 88 (JSON)
- 2026Scalability and Performance Evaluation of Federated Learning Frameworks: A Comparative Analysis14 Sep 2026
- 2026Beyond Parameter Space: NTK-Guided Personalized Aggregation for Robust Federated Learning12 Aug 2026
- 2026Sample Selection Using Multi-Task Autoencoders in Federated Learning with Non-IID Data28 Apr 2026
- 2026Exact Certification of Data-Poisoning Attacks Using Mixed-Integer Programming18 Feb 2026
- 2025Practical Framework for Privacy-Preserving and Byzantine-robust Federated Learning19 Dec 2025
- 2025DFedReweighting: A Unified Framework for Objective-Oriented Reweighting in Decentralized Federated Learning12 Dec 2025
- 2025Robust and Efficient Collaborative Learning9 Oct 2025
- 2025FairEquityFL -- A Fair and Equitable Client Selection in Federated Learning for Heterogeneous IoV Networks24 Sep 2025
- 2025Hammer and Anvil: Toward a Theory of Backdoors in Federated Learning9 Sep 2025
- 2025Enabling Trustworthy Federated Learning via Remote Attestation for Mitigating Byzantine Threats30 Aug 2025
- 2025FLAegis: A Two-Layer Defense Framework for Federated Learning Against Poisoning Attacks26 Aug 2025
- 2025FedUP: Efficient Pruning-based Federated Unlearning for Model Poisoning Attacks19 Aug 2025
38 more
- 2025Don't Reach for the Stars: Rethinking Topology for Resilient Federated Learning7 Aug 2025
- 2025ASMR: Angular Support for Malfunctioning Client Resilience in Federated Learning4 Aug 2025
- 2025Bridging Generalization Gap of Heterogeneous Federated Clients Using Generative Models3 Aug 2025
- 2025Wavelet Scattering Transform and Fourier Representation for Offline Detection of Malicious Clients in Federated Learning11 Jun 2025
- 2025FL-PLAS: Federated Learning with Partial Layer Aggregation for Backdoor Defense Against High-Ratio Malicious Clients17 May 2025
- 2025Byzantine-Robust Federated Learning Using Generative Adversarial Networks26 Mar 2025
- 2025Moss: Proxy Model-based Full-Weight Aggregation in Federated Learning with Heterogeneous Models13 Mar 2025
- 2025FedSV: Byzantine-Robust Federated Learning via Shapley Value24 Feb 2025
- 2025FedNIA: Noise-Induced Activation Analysis for Mitigating Data Poisoning in Federated Learning23 Feb 2025
- 2025FedEAT: A Robustness Optimization Framework for Federated LLMs17 Feb 2025
- 2025Decoding FL Defenses: Systemization, Pitfalls, and Remedies3 Feb 2025
- 2025FL-CLEANER: byzantine and backdoor defense by CLustering Errors of Activation maps in Non-iid fedErated leaRning21 Jan 2025
- 2024Fine-Tuning Personalization in Federated Learning to Mitigate Adversarial Clients30 Sep 2024
- 2024Leveraging Pre-trained Models for Robust Federated Learning for Kidney Stone Type Recognition30 Sep 2024
- 2024Data Distribution Shifts in (Industrial) Federated Learning as a Privacy Issue20 Sep 2024
- 2024Data Poisoning and Leakage Analysis in Federated Learning19 Sep 2024
- 2024BoBa: Boosting Backdoor Detection through Data Distribution Inference in Federated Learning12 Jul 2024
- 2024Non-Cooperative Backdoor Attacks in Federated Learning: A New Threat Landscape5 Jul 2024
- 2024A Whole-Process Certifiably Robust Aggregation Method Against Backdoor Attacks in Federated Learning30 Jun 2024
- 2024Communication-Efficient Byzantine-Resilient Federated Zero-Order Optimization20 Jun 2024
- 2024Certified Robustness to Data Poisoning in Gradient-Based Training9 Jun 2024
- 2024Marking the Pace: A Blockchain-Enhanced Privacy-Traceable Strategy for Federated Recommender Systems7 Jun 2024
- 2024Federated Learning in Healthcare: Model Misconducts, Security, Challenges, Applications, and Future Research Directions -- A Systematic Review22 May 2024
- 2024On the Volatility of Shapley-Based Contribution Metrics in Federated Learning13 May 2024
- 2024Fin-Fed-OD: Federated Outlier Detection on Financial Tabular Data23 Apr 2024
- 2024FLGuard: Byzantine-Robust Federated Learning via Ensemble of Contrastive Models5 Mar 2024
- 2024Decentralized Federated Learning: A Survey on Security and Privacy25 Jan 2024
- 2024Towards Efficient and Certified Recovery from Poisoning Attacks in Federated Learning16 Jan 2024
- 2023Data and Model Poisoning Backdoor Attacks on Wireless Federated Learning, and the Defense Mechanisms: A Comprehensive Survey14 Dec 2023
- 2023Defenses in Adversarial Machine Learning: A Survey13 Dec 2023
- 2023A Survey on Federated Unlearning: Challenges, Methods, and Future Directions31 Oct 2023
- 2023FLrce: Resource-Efficient Federated Learning with Early-Stopping Strategy15 Oct 2023
- 2023Kick Bad Guys Out! Conditionally Activated Anomaly Detection in Federated Learning with Zero-Knowledge Proof Verification6 Oct 2023
- 2023Towards Understanding Adversarial Transferability in Federated Learning1 Oct 2023
- 2023Resisting Backdoor Attacks in Federated Learning via Bidirectional Elections and Individual Perspective28 Sep 2023
- 2023SPIRT: A Fault-Tolerant and Reliable Peer-to-Peer Serverless ML Training Architecture25 Sep 2023
- 2023When Federated Learning meets Watermarking: A Comprehensive Overview of Techniques for Intellectual Property Protection7 Aug 2023
- 2023Heterogeneous Federated Learning: State-of-the-art and Research Challenges20 Jul 2023
50 newest of 88 All 88 (JSON)
- 2023A Survey on Federated Unlearning: Challenges, Methods, and Future Directionscited by 63
- 2024Certified Robustness to Data Poisoning in Gradient-Based Trainingcited by 18
- 2021Robust Federated Learning with Attack-Adaptive Aggregationcited by 17
- 2023Backdoor Learning for NLP: Recent Advances, Challenges, and Future Research Directionscited by 4
- 2026Exact Certification of Data-Poisoning Attacks Using Mixed-Integer Programmingcited by 4
- 2023Kick Bad Guys Out! Conditionally Activated Anomaly Detection in Federated Learning with Zero-Knowledge Proof Verificationcited by 2
- 2024Data Poisoning and Leakage Analysis in Federated Learningcited by 1
- 2025FedUP: Efficient Pruning-based Federated Unlearning for Model Poisoning Attackscited by 1
- 2025FedNIA: Noise-Induced Activation Analysis for Mitigating Data Poisoning in Federated Learningcited by 0
- 2026Exact Certification of Data-Poisoning Attacks Using Mixed-Integer Programming18 Feb 2026
- 2025FedUP: Efficient Pruning-based Federated Unlearning for Model Poisoning Attacks19 Aug 2025
- 2025FedNIA: Noise-Induced Activation Analysis for Mitigating Data Poisoning in Federated Learning23 Feb 2025
- 2024Data Poisoning and Leakage Analysis in Federated Learning19 Sep 2024
- 2024Certified Robustness to Data Poisoning in Gradient-Based Training9 Jun 2024
- 2023A Survey on Federated Unlearning: Challenges, Methods, and Future Directions31 Oct 2023
- 2023Kick Bad Guys Out! Conditionally Activated Anomaly Detection in Federated Learning with Zero-Knowledge Proof Verification6 Oct 2023
- 2023Backdoor Learning for NLP: Recent Advances, Challenges, and Future Research Directions14 Feb 2023
- 2021Robust Federated Learning with Attack-Adaptive Aggregation10 Feb 2021
- 2023Heterogeneous Federated Learning: State-of-the-art and Research Challengescited by 161
- 2022FLDetector: Defending Federated Learning Against Model Poisoning Attacks via Detecting Malicious Clientscited by 125
- 2022Neurotoxin: Durable Backdoors in Federated Learningcited by 98
- 2022Survey on Federated Learning Threats: concepts, taxonomy on attacks and defences, experimental study and challengescited by 84
- 2022DeepSight: Mitigating Backdoor Attacks in Federated Learning Through Deep Model Inspectioncited by 81
- 2022FedRecover: Recovering from Poisoning Attacks in Federated Learning using Historical Informationcited by 58
- 2022FLIP: A Provable Defense Framework for Backdoor Mitigation in Federated Learningcited by 37
- 2023Backdoor Attacks and Defenses in Federated Learning: Survey, Challenges and Future Research Directionscited by 33
- 2022LoMar: A Local Defense Against Poisoning Attack on Federated Learningcited by 31
- 2023Integration of Large Language Models and Federated Learningcited by 31
- 2024Decentralized Federated Learning: A Survey on Security and Privacycited by 25
- 2023A Survey of Trustworthy Federated Learning with Perspectives on Security, Robustness, and Privacycited by 24
12 most cited of 79 All 79 (JSON)
- 2026Scalability and Performance Evaluation of Federated Learning Frameworks: A Comparative Analysis14 Sep 2026
- 2026Beyond Parameter Space: NTK-Guided Personalized Aggregation for Robust Federated Learning12 Aug 2026
- 2026Sample Selection Using Multi-Task Autoencoders in Federated Learning with Non-IID Data28 Apr 2026
- 2025Practical Framework for Privacy-Preserving and Byzantine-robust Federated Learning19 Dec 2025
- 2025DFedReweighting: A Unified Framework for Objective-Oriented Reweighting in Decentralized Federated Learning12 Dec 2025
- 2025Robust and Efficient Collaborative Learning9 Oct 2025
- 2025FairEquityFL -- A Fair and Equitable Client Selection in Federated Learning for Heterogeneous IoV Networks24 Sep 2025
- 2025Hammer and Anvil: Toward a Theory of Backdoors in Federated Learning9 Sep 2025
- 2025Enabling Trustworthy Federated Learning via Remote Attestation for Mitigating Byzantine Threats30 Aug 2025
- 2025FLAegis: A Two-Layer Defense Framework for Federated Learning Against Poisoning Attacks26 Aug 2025
- 2025Don't Reach for the Stars: Rethinking Topology for Resilient Federated Learning7 Aug 2025
- 2025ASMR: Angular Support for Malfunctioning Client Resilience in Federated Learning4 Aug 2025
12 newest of 79 All 79 (JSON)