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Recent work has identified that classification models implemented as neural networks are vulnerable to data-poisoning and Trojan attacks at training time. In this work, we show that these training-time vulnerabilities extend to deep…

Cryptography and Security · Computer Science 2019-03-18 Panagiota Kiourti , Kacper Wardega , Susmit Jha , Wenchao Li

Skill-based agent systems tackle complex tasks by composing reusable skills, improving modularity and scalability while introducing a largely unexamined security attack surface. We propose SkillTrojan, a backdoor attack that targets skill…

Cryptography and Security · Computer Science 2026-05-29 Yunhao Feng , Yifan Ding , Yingshui Tan , Boren Zheng , Yanming Guo , Xiaolong Li , Kun Zhai , Yishan Li , Wenke Huang

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

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

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

Backdoor attacks pose a serious security threat to large language models (LLMs), which are increasingly deployed as general-purpose assistants in safety- and privacy-critical applications. Existing LLM backdoors rely primarily on…

Cryptography and Security · Computer Science 2026-05-15 Rui Wen , Mark Russinovich , Andrew Paverd , Jun Sakuma , Ahmed Salem

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

Emerging self-supervised learning (SSL) has become a popular image representation encoding method to obviate the reliance on labeled data and learn rich representations from large-scale, ubiquitous unlabelled data. Then one can train a…

Computer Vision and Pattern Recognition · Computer Science 2023-01-25 Jiaqi Xue , Qian Lou

Memory systems enable otherwise-stateless LLM agents to persist user information across sessions, but also introduce a new attack surface. We characterize the Trojan Hippo attack, a class of persistent memory attacks that operates in a more…

Cryptography and Security · Computer Science 2026-05-18 Debeshee Das , Julien Piet , Darya Kaviani , Luca Beurer-Kellner , Florian Tramèr , David Wagner

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

Along with the success of deep neural network (DNN) models, rise the threats to the integrity of these models. A recent threat is the Trojan attack where an attacker interferes with the training pipeline by inserting triggers into some of…

Computer Vision and Pattern Recognition · Computer Science 2020-12-09 Marzieh Edraki , Nazmul Karim , Nazanin Rahnavard , Ajmal Mian , Mubarak Shah

In recent years, the neural network backdoor hidden in the parameters of the federated learning model has been proved to have great security risks. Considering the characteristics of trigger generation, data poisoning and model training in…

Machine Learning · Computer Science 2024-04-23 Rong Wang , Guichen Zhou , Mingjun Gao , Yunpeng Xiao

Neuromorphic computing based on spiking neural networks (SNNs) is emerging as a promising alternative to traditional artificial neural networks (ANNs), offering unique advantages in terms of low power consumption. However, the security…

Neural and Evolutionary Computing · Computer Science 2025-03-31 Spyridon Raptis , Paul Kling , Ioannis Kaskampas , Ihsen Alouani , Haralampos-G. Stratigopoulos

As industry moves toward chiplet-based designs, the insertion of hardware Trojans poses a significant threat to the security of these systems. These systems rely heavily on cache coherence for coherent data communication, making coherence…

Cryptography and Security · Computer Science 2022-10-04 Gino A. Chacon , Charles Williams , Johann Knechtel , Ozgur Sinanoglu , Paul V. Gratz

Backdoor attack aims to deceive a victim model when facing backdoor instances while maintaining its performance on benign data. Current methods use manual patterns or special perturbations as triggers, while they often overlook the…

Computer Vision and Pattern Recognition · Computer Science 2024-01-05 Ruofei Wang , Renjie Wan , Zongyu Guo , Qing Guo , Rui Huang

Intuitively, a backdoor attack against Deep Neural Networks (DNNs) is to inject hidden malicious behaviors into DNNs such that the backdoor model behaves legitimately for benign inputs, yet invokes a predefined malicious behavior when its…

Cryptography and Security · Computer Science 2021-02-09 Shaofeng Li , Shiqing Ma , Minhui Xue , Benjamin Zi Hao Zhao

Recent advancements in deep learning-based compression techniques have surpassed traditional methods. However, deep neural networks remain vulnerable to backdoor attacks, where pre-defined triggers induce malicious behaviors. This paper…

Computer Vision and Pattern Recognition · Computer Science 2024-12-03 Yi Yu , Yufei Wang , Wenhan Yang , Lanqing Guo , Shijian Lu , Ling-Yu Duan , Yap-Peng Tan , Alex C. Kot

Model editing methods modify specific behaviors of Large Language Models by altering a small, targeted set of network weights and require very little data and compute. These methods can be used for malicious applications such as inserting…

Machine Learning · Computer Science 2025-09-08 Keltin Grimes , Marco Christiani , David Shriver , Marissa Connor

This paper investigates backdoor attacks in image-oriented semantic communications. The threat of backdoor attacks on symbol reconstruction in semantic communication (SemCom) systems has received limited attention. Previous research on…

Cryptography and Security · Computer Science 2026-03-30 Jialin Wan , Jinglong Shen , Nan Cheng , Zhisheng Yin , Yiliang Liu , Wenchao Xu , Xuemin , Shen

Modern language models remain vulnerable to backdoor attacks via poisoned data, where training inputs containing a trigger are paired with a target output, causing the model to reproduce that behavior whenever the trigger appears at…

Cryptography and Security · Computer Science 2026-01-06 Eric Xue , Ruiyi Zhang , Pengtao Xie