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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

Contrastive Learning (CL) has attracted enormous attention due to its remarkable capability in unsupervised representation learning. However, recent works have revealed the vulnerability of CL to backdoor attacks: the feature extractor…

Cryptography and Security · Computer Science 2024-04-12 Weiyu Sun , Xinyu Zhang , Hao Lu , Yingcong Chen , Ting Wang , Jinghui Chen , Lu Lin

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

Machine learning backdoors have the property that the machine learning model should work as expected on normal inputs, but when the input contains a specific $\textit{trigger}$, it behaves as the attacker desires. Detecting such triggers…

Cryptography and Security · Computer Science 2026-03-12 Eirik Høyheim , Magnus Wiik Eckhoff , Gudmund Grov , Robert Flood , David Aspinall

Recent works have demonstrated the vulnerability of Deep Reinforcement Learning (DRL) algorithms against training-time, backdoor poisoning attacks. The objectives of these attacks are twofold: induce pre-determined, adversarial behavior in…

Machine Learning · Computer Science 2025-06-04 Ethan Rathbun , Alina Oprea , Christopher Amato

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

Backdoor attacks represent a serious threat to neural network models. A backdoored model will misclassify the trigger-embedded inputs into an attacker-chosen target label while performing normally on other benign inputs. There are already…

Machine Learning · Computer Science 2021-07-14 Jing Xu , Minhui , Xue , Stjepan Picek

Backdoor attacks on reinforcement learning implant a backdoor in a victim agent's policy. Once the victim observes the trigger signal, it will switch to the abnormal mode and fail its task. Most of the attacks assume the adversary can…

Multiagent Systems · Computer Science 2022-11-22 Shuo Chen , Yue Qiu , Jie Zhang

In recent years, there has been an explosive growth in multimodal learning. Image captioning, a classical multimodal task, has demonstrated promising applications and attracted extensive research attention. However, recent studies have…

Cryptography and Security · Computer Science 2024-06-11 Wenshu Fan , Hongwei Li , Wenbo Jiang , Meng Hao , Shui Yu , Xiao Zhang

Web-scraped datasets are vulnerable to data poisoning, which can be used for backdooring deep image classifiers during training. Since training on large datasets is expensive, a model is trained once and re-used many times. Unlike…

Machine Learning · Computer Science 2024-01-23 Benjamin Schneider , Nils Lukas , Florian Kerschbaum

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

Fine-tuning pre-trained models for downstream tasks has led to a proliferation of open-sourced task-specific models. Recently, Model Merging (MM) has emerged as an effective approach to facilitate knowledge transfer among these…

Cryptography and Security · Computer Science 2024-09-04 Jinghuai Zhang , Jianfeng Chi , Zheng Li , Kunlin Cai , Yang Zhang , Yuan Tian

In recent years, neural backdoor attack has been considered to be a potential security threat to deep learning systems. Such systems, while achieving the state-of-the-art performance on clean data, perform abnormally on inputs with…

Cryptography and Security · Computer Science 2020-10-19 Anh Nguyen , Anh Tran

The vulnerabilities to backdoor attacks have recently threatened the trustworthiness of machine learning models in practical applications. Conventional wisdom suggests that not everyone can be an attacker since the process of designing the…

Cryptography and Security · Computer Science 2023-09-06 Sze Jue Yang , Quang Nguyen , Chee Seng Chan , Khoa D. Doan

Federated learning allows multiple users to collaboratively train a shared classification model while preserving data privacy. This approach, where model updates are aggregated by a central server, was shown to be vulnerable to poisoning…

Machine Learning · Computer Science 2020-12-17 Chien-Lun Chen , Leana Golubchik , Marco Paolieri

In autonomous driving, behavior prediction is fundamental for safe motion planning, hence the security and robustness of prediction models against adversarial attacks are of paramount importance. We propose a novel adversarial backdoor…

Computer Vision and Pattern Recognition · Computer Science 2023-11-23 Mozhgan Pourkeshavarz , Mohammad Sabokrou , Amir Rasouli

Deep learning models are susceptible to adversarial attacks, where slight perturbations to input data lead to misclassification. Adversarial attacks become increasingly effective with access to information about the targeted classifier. In…

Machine Learning · Computer Science 2024-05-29 Yu Zhe , Rei Nagaike , Daiki Nishiyama , Kazuto Fukuchi , Jun Sakuma

As collaborative learning and the outsourcing of data collection become more common, malicious actors (or agents) which attempt to manipulate the learning process face an additional obstacle as they compete with each other. In backdoor…

Machine Learning · Computer Science 2021-10-12 Siddhartha Datta , Giulio Lovisotto , Ivan Martinovic , Nigel Shadbolt

Malicious agents in collaborative learning and outsourced data collection threaten the training of clean models. Backdoor attacks, where an attacker poisons a model during training to successfully achieve targeted misclassification, are a…

Machine Learning · Computer Science 2022-01-31 Siddhartha Datta , Nigel Shadbolt

Backdoor attacks have severely threatened deep neural network (DNN) models in the past several years. These attacks can occur in almost every stage of the deep learning pipeline. Although the attacked model behaves normally on benign…

Computer Vision and Pattern Recognition · Computer Science 2024-05-21 Yangming Chen