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Under a commonly-studied backdoor poisoning attack against classification models, an attacker adds a small trigger to a subset of the training data, such that the presence of this trigger at test time causes the classifier to always predict…

Machine Learning · Computer Science 2021-10-06 Mingjie Sun , Siddhant Agarwal , J. Zico Kolter

Machine learning (ML) has made tremendous progress during the past decade and is being adopted in various critical real-world applications. However, recent research has shown that ML models are vulnerable to multiple security and privacy…

Cryptography and Security · Computer Science 2022-03-07 Ahmed Salem , Rui Wen , Michael Backes , Shiqing Ma , Yang Zhang

Backdoor attacks are a kind of emergent security threat in deep learning. After being injected with a backdoor, a deep neural model will behave normally on standard inputs but give adversary-specified predictions once the input contains…

Cryptography and Security · Computer Science 2022-10-20 Yangyi Chen , Fanchao Qi , Hongcheng Gao , Zhiyuan Liu , Maosong Sun

Graph neural network (GNN) have demonstrated exceptional performance in solving critical problems across diverse domains yet remain susceptible to backdoor attacks. Existing studies on backdoor attack for graph classification are limited to…

Machine Learning · Computer Science 2026-04-09 Md Nabi Newaz Khan , Abdullah Arafat Miah , Yu Bi

Heterogeneous graph neural networks (HGNNs) have achieved strong performance in many real-world applications, yet targeted backdoor poisoning on heterogeneous graphs remains less studied. We consider backdoor attacks for heterogeneous node…

Machine Learning · Computer Science 2026-01-01 Honglin Gao , Lan Zhao , Junhao Ren , Xiang Li , Gaoxi Xiao

Although deep neural networks (DNNs) have made rapid progress in recent years, they are vulnerable in adversarial environments. A malicious backdoor could be embedded in a model by poisoning the training dataset, whose intention is to make…

Cryptography and Security · Computer Science 2021-03-25 Yinpeng Dong , Xiao Yang , Zhijie Deng , Tianyu Pang , Zihao Xiao , Hang Su , Jun Zhu

We present a novel methodology for neural network backdoor attacks. Unlike existing training-time attacks where the Trojaned network would respond to the Trojan trigger after training, our approach inserts a Trojan that will remain dormant…

Cryptography and Security · Computer Science 2022-11-04 Feisi Fu , Panagiota Kiourti , Wenchao Li

Outsourced training and machine learning as a service have resulted in novel attack vectors like backdoor attacks. Such attacks embed a secret functionality in a neural network activated when the trigger is added to its input. In most works…

Cryptography and Security · Computer Science 2022-11-08 Stefanos Koffas , Stjepan Picek , Mauro Conti

In a backdoor attack, an adversary inserts maliciously constructed backdoor examples into a training set to make the resulting model vulnerable to manipulation. Defending against such attacks typically involves viewing these inserted…

Cryptography and Security · Computer Science 2023-07-20 Alaa Khaddaj , Guillaume Leclerc , Aleksandar Makelov , Kristian Georgiev , Hadi Salman , Andrew Ilyas , Aleksander Madry

Backdoor attack injects malicious behavior to models such that inputs embedded with triggers are misclassified to a target label desired by the attacker. However, natural features may behave like triggers, causing misclassification once…

Machine Learning · Computer Science 2021-03-18 Yingqi Liu , Guangyu Shen , Guanhong Tao , Zhenting Wang , Shiqing Ma , Xiangyu Zhang

Deep learning achieves outstanding results in many machine learning tasks. Nevertheless, it is vulnerable to backdoor attacks that modify the training set to embed a secret functionality in the trained model. The modified training samples…

Computer Vision and Pattern Recognition · Computer Science 2023-04-24 Gorka Abad , Jing Xu , Stefanos Koffas , Behrad Tajalli , Stjepan Picek , Mauro Conti

As an essential tool in security, the intrusion detection system bears the responsibility of the defense to network attacks performed by malicious traffic. Nowadays, with the help of machine learning algorithms, intrusion detection systems…

Cryptography and Security · Computer Science 2022-05-11 Zilong Lin , Yong Shi , Zhi Xue

Backdoor attacks pose a significant security threat to natural language processing (NLP) systems, but existing methods lack explainable trigger mechanisms and fail to quantitatively model vulnerability patterns. This work pioneers the…

Cryptography and Security · Computer Science 2025-09-24 Gejian Zhao , Hanzhou Wu , Xinpeng Zhang

Deep neural networks have been shown to be vulnerable to backdoor attacks, which could be easily introduced to the training set prior to model training. Recent work has focused on investigating backdoor attacks on natural images or toy…

Cryptography and Security · Computer Science 2021-01-05 Munachiso Nwadike , Takumi Miyawaki , Esha Sarkar , Michail Maniatakos , Farah Shamout

Backdoor attacks allow an attacker to embed a specific vulnerability in a machine learning algorithm, activated when an attacker-chosen pattern is presented, causing a specific misprediction. The need to identify backdoors in biometric…

Computer Vision and Pattern Recognition · Computer Science 2024-11-05 Alexander Unnervik , Hatef Otroshi Shahreza , Anjith George , Sébastien Marcel

Deep learning models are widely deployed in various applications but remain vulnerable to stealthy adversarial threats, particularly backdoor attacks. Backdoor models trained on poisoned datasets behave normally with clean inputs but cause…

Cryptography and Security · Computer Science 2025-11-18 Chengrui Sun , Hua Zhang , Haoran Gao , Shang Wang , Zian Tian , Jianjin Zhao , Qi Li , Hongliang Zhu , Zongliang Shen , Anmin Fu

Self-supervised and multimodal vision encoders learn strong visual representations that are widely adopted in downstream vision tasks and large vision-language models (LVLMs). However, downstream users often rely on third-party pretrained…

Computer Vision and Pattern Recognition · Computer Science 2026-03-17 Siquan Huang , Yijiang Li , Ningzhi Gao , Xingfu Yan , Leyu Shi , Ying Gao

Backdoor attacks (BAs) are an emerging threat to deep neural network classifiers. A victim classifier will predict to an attacker-desired target class whenever a test sample is embedded with the same backdoor pattern (BP) that was used to…

Cryptography and Security · Computer Science 2022-03-15 Zhen Xiang , David J. Miller , George Kesidis

Time series classification (TSC) is a cornerstone of modern web applications, powering tasks such as financial data analysis, network traffic monitoring, and user behavior analysis. In recent years, deep neural networks (DNNs) have greatly…

Machine Learning · Computer Science 2025-05-20 Yuanmin Huang , Mi Zhang , Zhaoxiang Wang , Wenxuan Li , Min Yang

Backdoor attacks pose a significant threat to neural networks, enabling adversaries to manipulate model outputs on specific inputs, often with devastating consequences, especially in critical applications. While backdoor attacks have been…

Machine Learning · Computer Science 2025-07-30 Zhen Guo , Abhinav Kumar , Reza Tourani