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Backdoors on federated learning will be diluted by subsequent benign updates. This is reflected in the significant reduction of attack success rate as iterations increase, ultimately failing. We use a new metric to quantify the degree of…

Cryptography and Security · Computer Science 2024-04-30 Tao Liu , Yuhang Zhang , Zhu Feng , Zhiqin Yang , Chen Xu , Dapeng Man , Wu Yang

Self-supervised learning (SSL) is increasingly attractive for pre-training encoders without requiring labeled data. Downstream tasks built on top of those pre-trained encoders can achieve nearly state-of-the-art performance. The pre-trained…

Machine Learning · Computer Science 2025-10-06 Tingxu Han , Weisong Sun , Ziqi Ding , Chunrong Fang , Hanwei Qian , Jiaxun Li , Zhenyu Chen , Xiangyu Zhang

Backdoor attacks on deep learning represent a recent threat that has gained significant attention in the research community. Backdoor defenses are mainly based on backdoor inversion, which has been shown to be generic, model-agnostic, and…

Machine Learning · Computer Science 2024-11-11 Xiaoyun Xu , Zhuoran Liu , Stefanos Koffas , Shujian Yu , Stjepan Picek

The advent of Large Language Models (LLMs) has marked significant achievements in language processing and reasoning capabilities. Despite their advancements, LLMs face vulnerabilities to data poisoning attacks, where the adversary inserts…

Machine Learning · Computer Science 2025-05-30 Xiangyu Zhou , Yao Qiang , Saleh Zare Zade , Mohammad Amin Roshani , Prashant Khanduri , Douglas Zytko , Dongxiao Zhu

The prompt-based learning paradigm, which bridges the gap between pre-training and fine-tuning, achieves state-of-the-art performance on several NLP tasks, particularly in few-shot settings. Despite being widely applied, prompt-based…

Computation and Language · Computer Science 2024-02-05 Shuai Zhao , Jinming Wen , Luu Anh Tuan , Junbo Zhao , Jie Fu

Federated learning is a promising approach for training machine learning models while preserving data privacy. However, its distributed nature makes it vulnerable to backdoor attacks, particularly in NLP tasks, where related research…

Machine Learning · Computer Science 2025-07-31 Minyeong Choe , Cheolhee Park , Changho Seo , Hyunil Kim

As society grows more reliant on machine learning, ensuring the security of machine learning systems against sophisticated attacks becomes a pressing concern. A recent result of Goldwasser, Kim, Vaikuntanathan, and Zamir (2022) shows that…

Machine Learning · Computer Science 2024-11-06 Shafi Goldwasser , Jonathan Shafer , Neekon Vafa , Vinod Vaikuntanathan

Deep neural networks (DNNs) have achieved remarkable success in computer vision tasks such as image classification, segmentation, and object detection. However, they are vulnerable to adversarial attacks, which can cause incorrect…

Computer Vision and Pattern Recognition · Computer Science 2025-11-03 Suklav Ghosh , Sonal Kumar , Arijit Sur

Distributed learning is central for large-scale training of deep-learning models. However, they are exposed to a security threat in which Byzantine participants can interrupt or control the learning process. Previous attack models and their…

Machine Learning · Computer Science 2021-11-16 Moran Baruch , Gilad Baruch , Yoav Goldberg

Data-poisoning based backdoor attacks aim to insert backdoor into models by manipulating training datasets without controlling the training process of the target model. Existing attack methods mainly focus on designing triggers or fusion…

Cryptography and Security · Computer Science 2023-07-17 Zihao Zhu , Mingda Zhang , Shaokui Wei , Li Shen , Yanbo Fan , Baoyuan Wu

Backdoor learning is a critical research topic for understanding the vulnerabilities of deep neural networks. While the diffusion model (DM) has been broadly deployed in public over the past few years, the understanding of its backdoor…

Cryptography and Security · Computer Science 2025-07-22 Weilin Lin , Nanjun Zhou , Yanyun Wang , Jianze Li , Hui Xiong , Li Liu

Self-Supervised Learning (SSL) is an effective paradigm for learning representations from unlabeled data, such as text, images, and videos. However, researchers have recently found that SSL is vulnerable to backdoor attacks. The attacker…

Computer Vision and Pattern Recognition · Computer Science 2024-11-04 Shengsheng Qian , Dizhan Xue , Yifei Wang , Shengjie Zhang , Huaiwen Zhang , Changsheng Xu

Backdoor attacks, which maliciously control a well-trained model's outputs of the instances with specific triggers, are recently shown to be serious threats to the safety of reusing deep neural networks (DNNs). In this work, we propose an…

Computation and Language · Computer Science 2021-10-18 Wenkai Yang , Yankai Lin , Peng Li , Jie Zhou , Xu Sun

DNNs' demand for massive data forces practitioners to collect data from the Internet without careful check due to the unacceptable cost, which brings potential risks of backdoor attacks. A backdoored model always predicts a target class in…

Machine Learning · Computer Science 2022-02-23 Yinghua Gao , Dongxian Wu , Jingfeng Zhang , Guanhao Gan , Shu-Tao Xia , Gang Niu , Masashi Sugiyama

Backdoor attacks present a significant threat to the robustness of Federated Learning (FL) due to their stealth and effectiveness. They maintain both the main task of the FL system and the backdoor task simultaneously, causing malicious…

Machine Learning · Computer Science 2024-11-05 Jiahao Xu , Zikai Zhang , Rui Hu

Backdoor attacks are a significant threat to large language models (LLMs), often embedded via public checkpoints, yet existing defenses rely on impractical assumptions about trigger settings. To address this challenge, we propose…

Computation and Language · Computer Science 2026-05-14 Liang Lin , Miao Yu , Moayad Aloqaily , Zhenhong Zhou , Kun Wang , Linsey Pang , Prakhar Mehrotra , Qingsong Wen

Contrastive Vision-Language Pre-training, known as CLIP, has shown promising effectiveness in addressing downstream image recognition tasks. However, recent works revealed that the CLIP model can be implanted with a downstream-oriented…

Computer Vision and Pattern Recognition · Computer Science 2024-03-25 Jiawang Bai , Kuofeng Gao , Shaobo Min , Shu-Tao Xia , Zhifeng Li , Wei Liu

Backdoor (trojan) attacks embed hidden, controllable behaviors into machine-learning models so that models behave normally on benign inputs but produce attacker-chosen outputs when a trigger is present. This survey reviews the rapidly…

Cryptography and Security · Computer Science 2025-09-10 Bilal Hussain Abbasi , Yanjun Zhang , Leo Zhang , Shang Gao

This work provides the community with a timely comprehensive review of backdoor attacks and countermeasures on deep learning. According to the attacker's capability and affected stage of the machine learning pipeline, the attack surfaces…

Cryptography and Security · Computer Science 2020-08-04 Yansong Gao , Bao Gia Doan , Zhi Zhang , Siqi Ma , Jiliang Zhang , Anmin Fu , Surya Nepal , Hyoungshick Kim

As Machine Learning (ML) evolves, the complexity and sophistication of security threats against this paradigm continue to grow as well, threatening data privacy and model integrity. In response, Machine Unlearning (MU) is a recent…

Cryptography and Security · Computer Science 2025-10-13 Muhammed Shafi K. P. , Serena Nicolazzo , Antonino Nocera , Vinod P