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Federated learning (FL) is vulnerable to poisoning attacks, where adversaries corrupt the global aggregation results and cause denial-of-service (DoS). Unlike recent model poisoning attacks that optimize the amplitude of malicious…

Machine Learning · Computer Science 2024-09-27 Hangtao Zhang , Zeming Yao , Leo Yu Zhang , Shengshan Hu , Chao Chen , Alan Liew , Zhetao Li

With the rise of Large Language Models (LLMs) in recent years, abundant new opportunities are emerging, but also new challenges, among which contamination is quickly becoming critical. Business applications and fundraising in Artificial…

Computation and Language · Computer Science 2025-07-11 Mathieu Ravaut , Bosheng Ding , Fangkai Jiao , Hailin Chen , Xingxuan Li , Ruochen Zhao , Chengwei Qin , Caiming Xiong , Shafiq Joty

Large Language Models (LLMs) have demonstrated great capabilities in natural language understanding and generation, largely attributed to the intricate alignment process using human feedback. While alignment has become an essential training…

Computation and Language · Computer Science 2024-09-04 Bocheng Chen , Hanqing Guo , Guangjing Wang , Yuanda Wang , Qiben Yan

Large Language Models (LLMs) are widely deployed in diverse real-world settings, yet remain vulnerable to jailbreaking, where prompt-based attacks bypass safety filters. We present THREAT (Targeted Harmful generation via Reframing and…

Cryptography and Security · Computer Science 2026-05-22 Shahnewaz Karim Sakib , Swati Kar , Anindya Bijoy Das

Jailbreak attacks in large language models (LLMs) entail inducing the models to generate content that breaches ethical and legal norm through the use of malicious prompts, posing a substantial threat to LLM security. Current strategies for…

Cryptography and Security · Computer Science 2024-06-07 Lin Lu , Hai Yan , Zenghui Yuan , Jiawen Shi , Wenqi Wei , Pin-Yu Chen , Pan Zhou

Distributed machine learning has been widely used in recent years to tackle the large and complex dataset problem. Therewith, the security of distributed learning has also drawn increasing attentions from both academia and industry. In this…

Machine Learning · Computer Science 2022-06-13 Zihao Zhao , Mengen Luo , Wenbo Ding

Poisoning attacks can compromise the safety of large language models (LLMs) by injecting malicious documents into their training data. Existing work has studied pretraining poisoning assuming adversaries control a percentage of the training…

Large Language Models (LLMs), such as ChatGPT, LLaMA, GLM, and PaLM, have exhibited remarkable performances across various tasks in recent years. However, LLMs face two main challenges in real-world applications. One challenge is that…

Machine Learning · Computer Science 2023-10-17 Tao Fan , Yan Kang , Guoqiang Ma , Weijing Chen , Wenbin Wei , Lixin Fan , Qiang Yang

As Speech Large Language Models (Speech LLMs) become increasingly integrated into voice-based applications, ensuring their robustness against manipulative or adversarial input becomes critical. Although prior work has studied adversarial…

Computation and Language · Computer Science 2026-05-25 Jinyang Wu , Bin Zhu , Xiandong Zou , Qiquan Zhang , Xu Fang , Pan Zhou

Large Language Models (LLMs) have performed exceptionally in various text-generative tasks, including question answering, translation, code completion, etc. However, the over-assistance of LLMs has raised the challenge of "jailbreaking",…

Cryptography and Security · Computer Science 2024-09-02 Sibo Yi , Yule Liu , Zhen Sun , Tianshuo Cong , Xinlei He , Jiaxing Song , Ke Xu , Qi Li

Large Language Models (LLMs) have achieved remarkable progress in natural language understanding, reasoning, and autonomous decision-making. However, these advancements have also come with significant privacy concerns. While significant…

Cryptography and Security · Computer Science 2026-01-27 Yuntao Du , Zitao Li , Ninghui Li , Bolin Ding

Recent studies have uncovered a troubling vulnerability in the fine-tuning stage of large language models (LLMs): even fine-tuning on entirely benign datasets can lead to a significant increase in the harmfulness of LLM outputs. Building on…

Machine Learning · Computer Science 2025-05-27 Zihan Guan , Mengxuan Hu , Ronghang Zhu , Sheng Li , Anil Vullikanti

Large Language Models (LLMs) are increasingly vulnerable to adversarial prompts that exploit semantic ambiguities to bypass safety mechanisms, resulting in harmful or inappropriate outputs. Such attacks, including jailbreaking and prompt…

Cryptography and Security · Computer Science 2026-05-28 Xiang Fang , Wanlong Fang

Low-Rank Adaptation (LoRA) has become a popular solution for fine-tuning large language models (LLMs) in federated settings, dramatically reducing update costs by introducing trainable low-rank matrices. However, when integrated with…

Cryptography and Security · Computer Science 2026-01-05 Yueyan Dong , Minghui Xu , Qin Hu , Yinhao Xiao , Qi Luo , Yechao Zhang , Yue Zhang , Xiuzhen Cheng

The integration of Large Language Models (LLMs) and Multi-modal Large Language Models (MLLMs) into mobile GUI agents has significantly enhanced user efficiency and experience. However, this advancement also introduces potential security…

Cryptography and Security · Computer Science 2025-03-18 Yulong Yang , Xinshan Yang , Shuaidong Li , Chenhao Lin , Zhengyu Zhao , Chao Shen , Tianwei Zhang

Graph analysis has become increasingly popular with the prevalence of big data and machine learning. Traditional graph data analysis methods often assume the existence of a trusted third party to collect and store the graph data, which does…

Cryptography and Security · Computer Science 2024-12-31 Xi He , Kai Huang , Qingqing Ye , Haibo Hu

Federated Learning (FL) is a machine learning (ML) approach that enables multiple decentralized devices or edge servers to collaboratively train a shared model without exchanging raw data. During the training and sharing of model updates…

Cryptography and Security · Computer Science 2024-03-06 Ehsan Nowroozi , Imran Haider , Rahim Taheri , Mauro Conti

While large language models (LLMs) present significant potential for supporting numerous real-world applications and delivering positive social impacts, they still face significant challenges in terms of the inherent risk of privacy…

Artificial Intelligence · Computer Science 2025-01-17 Huandong Wang , Wenjie Fu , Yingzhou Tang , Zhilong Chen , Yuxi Huang , Jinghua Piao , Chen Gao , Fengli Xu , Tao Jiang , Yong Li

Manipulation of local training data and local updates, i.e., the poisoning attack, is the main threat arising from the collaborative nature of the federated learning (FL) paradigm. Most existing poisoning attacks aim to manipulate local…

Machine Learning · Computer Science 2025-05-30 Huazi Pan , Yanjun Zhang , Leo Yu Zhang , Scott Adams , Abbas Kouzani , Suiyang Khoo

Recent advances in the development of large language models have resulted in public access to state-of-the-art pre-trained language models (PLMs), including Generative Pre-trained Transformer 3 (GPT-3) and Bidirectional Encoder…