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Large Language Models (LLMs), despite their impressive capabilities across domains, have been shown to be vulnerable to backdoor attacks. Prior backdoor strategies predominantly operate at the token level, where an injected trigger causes…

Cryptography and Security · Computer Science 2026-04-17 Vu Tuan Truong , Long Bao Le

We reveal the theoretical foundations of techniques for editing large language models, and present new methods which can do so without requiring retraining. Our theoretical insights show that a single metric (a measure of the intrinsic…

Artificial Intelligence · Computer Science 2024-10-31 Oliver J. Sutton , Qinghua Zhou , Wei Wang , Desmond J. Higham , Alexander N. Gorban , Alexander Bastounis , Ivan Y. Tyukin

Model adaptation tackles the distribution shift problem with a pre-trained model instead of raw data, which has become a popular paradigm due to its great privacy protection. Existing methods always assume adapting to a clean target domain,…

Cryptography and Security · Computer Science 2025-02-18 Lijun Sheng , Jian Liang , Ran He , Zilei Wang , Tieniu Tan

Large language models (LLMs) have gained widespread adoption across diverse applications due to their impressive generative capabilities. Their plug-and-play nature enables both developers and end users to interact with these models through…

Cryptography and Security · Computer Science 2025-10-21 Zongze Li , Jiawei Guo , Haipeng Cai

In Natural Language Processing (NLP), intelligent neuron models can be susceptible to textual Trojan attacks. Such attacks occur when Trojan models behave normally for standard inputs but generate malicious output for inputs that contain a…

Computation and Language · Computer Science 2023-08-23 Qian Lou , Yepeng Liu , Bo Feng

Large language models (LLMs) have exhibited remarkable versatility and adaptability, while their widespread adoption across various applications also raises critical safety concerns. This paper focuses on the impact of backdoored LLMs.…

Computation and Language · Computer Science 2025-09-03 Jiyang Qiu , Xinbei Ma , Zhuosheng Zhang , Hai Zhao , Yun Li , Qianren Wang

Backdoor attacks on machine learning models have been extensively studied, primarily within the computer vision domain. Originally, these attacks manipulated classifiers to generate incorrect outputs in the presence of specific, often…

Machine Learning · Computer Science 2025-03-25 Sharon Lin , Krishnamurthy , Dvijotham , Jamie Hayes , Chongyang Shi , Ilia Shumailov , Shuang Song

Large language models (LLMs) are becoming an integrated part of software development. These models are trained on large datasets for code, where it is hard to verify each data point. Therefore, a potential attack surface can be to inject…

Software Engineering · Computer Science 2023-12-12 Aftab Hussain , Md Rafiqul Islam Rabin , Toufique Ahmed , Mohammad Amin Alipour , Bowen Xu

With tools like GitHub Copilot, automatic code suggestion is no longer a dream in software engineering. These tools, based on large language models, are typically trained on massive corpora of code mined from unvetted public sources. As a…

Cryptography and Security · Computer Science 2024-01-25 Hojjat Aghakhani , Wei Dai , Andre Manoel , Xavier Fernandes , Anant Kharkar , Christopher Kruegel , Giovanni Vigna , David Evans , Ben Zorn , Robert Sim

Recent work has demonstrated robust mechanisms by which attacks can be orchestrated on machine learning models. In contrast to adversarial examples, backdoor or trojan attacks embed surgically modified samples with targeted labels in the…

Cryptography and Security · Computer Science 2019-03-19 Zhaoyuan Yang , Naresh Iyer , Johan Reimann , Nurali Virani

Large reasoning models (LRMs) have emerged as a significant advancement in artificial intelligence, representing a specialized class of large language models (LLMs) designed to tackle complex reasoning tasks. The defining characteristic of…

Computation and Language · Computer Science 2025-07-25 Biao Yi , Zekun Fei , Jianing Geng , Tong Li , Lihai Nie , Zheli Liu , Yiming Li

Large language models (LLMs) have shown great success in various Natural Language Processing (NLP) tasks, whist they still need updates after deployment to fix errors or keep pace with the changing knowledge in the world. Researchers…

Computation and Language · Computer Science 2023-12-20 Lang Yu , Qin Chen , Jie Zhou , Liang He

Large Language Models (LLMs) are progressively being utilized as machine learning services and interface tools for various applications. However, the security implications of LLMs, particularly in relation to adversarial and Trojan attacks,…

Cryptography and Security · Computer Science 2023-11-01 Jiaqi Xue , Mengxin Zheng , Ting Hua , Yilin Shen , Yepeng Liu , Ladislau Boloni , Qian Lou

Recent studies have revealed that \textit{Backdoor Attacks} can threaten the safety of natural language processing (NLP) models. Investigating the strategies of backdoor attacks will help to understand the model's vulnerability. Most…

Machine Learning · Computer Science 2023-10-26 Weimin Lyu , Songzhu Zheng , Lu Pang , Haibin Ling , Chao Chen

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

Large language models (LLMs) can effectively handle outdated information through knowledge editing. However, current approaches face two key limitations: (I) Poor generalization: Most approaches rigidly inject new knowledge without ensuring…

Computation and Language · Computer Science 2026-04-08 Jinhu Fu , Yan Bai , Longzhu He , Yihang Lou , Yanxiao Zhao , Li Sun , Sen Su

A trojan backdoor is a hidden pattern typically implanted in a deep neural network. It could be activated and thus forces that infected model behaving abnormally only when an input data sample with a particular trigger present is fed to…

Cryptography and Security · Computer Science 2019-08-12 Wenbo Guo , Lun Wang , Xinyu Xing , Min Du , Dawn Song

Large Language Models (LLMs) are known to be vulnerable to backdoor attacks, where triggers embedded in poisoned samples can maliciously alter LLMs' behaviors. In this paper, we move beyond attacking LLMs and instead examine backdoor…

Cryptography and Security · Computer Science 2025-02-18 Huaizhi Ge , Yiming Li , Qifan Wang , Yongfeng Zhang , Ruixiang Tang

Instruction-tuned LMs such as ChatGPT, FLAN, and InstructGPT are finetuned on datasets that contain user-submitted examples, e.g., FLAN aggregates numerous open-source datasets and OpenAI leverages examples submitted in the browser…

Computation and Language · Computer Science 2023-05-02 Alexander Wan , Eric Wallace , Sheng Shen , Dan Klein

While machine learning (ML) models are being increasingly trusted to make decisions in different and varying areas, the safety of systems using such models has become an increasing concern. In particular, ML models are often trained on data…