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Large Language Models (LLMs) have gained considerable popularity and protected by increasingly sophisticated safety mechanisms. However, jailbreak attacks continue to pose a critical security threat by inducing models to generate…

Cryptography and Security · Computer Science 2025-12-23 Zehao Liu , Xi Lin

Large Language Models (LLMs) are commonly evaluated for robustness against paraphrased or semantically equivalent jailbreak prompts, yet little attention has been paid to linguistic variation as an attack surface. In this work, we…

Computation and Language · Computer Science 2025-11-14 Srikant Panda , Avinash Rai

Large Language Models (LLMs) have been shown to be susceptible to jailbreak attacks, or adversarial attacks used to illicit high risk behavior from a model. Jailbreaks have been exploited by cybercriminals and blackhat actors to cause…

Computation and Language · Computer Science 2025-01-07 Joao Fonseca , Andrew Bell , Julia Stoyanovich

The rise of Large Language Models (LLMs) has revolutionized our comprehension of intelligence bringing us closer to Artificial Intelligence. Since their introduction, researchers have actively explored the applications of LLMs across…

Cryptography and Security · Computer Science 2024-02-05 Farzad Nourmohammadzadeh Motlagh , Mehrdad Hajizadeh , Mehryar Majd , Pejman Najafi , Feng Cheng , Christoph Meinel

Defending large language models (LLMs) against jailbreak attacks is crucial for ensuring their safe deployment. Existing defense strategies typically rely on predefined static criteria to differentiate between harmful and benign prompts.…

Cryptography and Security · Computer Science 2025-05-21 Rui Pu , Chaozhuo Li , Rui Ha , Litian Zhang , Lirong Qiu , Xi Zhang

Large Language Models (LLMs) are known to be vulnerable to jailbreaking attacks, wherein adversaries exploit carefully engineered prompts to induce harmful or unethical responses. Such threats have raised critical concerns about the safety…

Cryptography and Security · Computer Science 2025-05-22 Taiye Chen , Zeming Wei , Ang Li , Yisen Wang

Textual data is often represented as real-numbered embeddings in NLP, particularly with the popularity of large language models (LLMs) and Embeddings as a Service (EaaS). However, storing sensitive information as embeddings can be…

Computation and Language · Computer Science 2024-06-06 Yiyi Chen , Heather Lent , Johannes Bjerva

While significant attention has been dedicated to exploiting weaknesses in LLMs through jailbreaking attacks, there remains a paucity of effort in defending against these attacks. We point out a pivotal factor contributing to the success of…

Computation and Language · Computer Science 2024-06-13 Zhexin Zhang , Junxiao Yang , Pei Ke , Fei Mi , Hongning Wang , Minlie Huang

Large language models (LLMs) are widely adapted for downstream applications through fine-tuning, a process named customization. However, recent studies have identified a vulnerability during this process, where malicious samples can…

Cryptography and Security · Computer Science 2025-02-19 Xiaoqun Liu , Jiacheng Liang , Luoxi Tang , Muchao Ye , Weicheng Ma , Zhaohan Xi

Large language models (LLMs) have been increasingly applied to various domains, which triggers increasing concerns about LLMs' safety on specialized domains, e.g. medicine. Despite prior explorations on general jailbreaking attacks, there…

Computation and Language · Computer Science 2025-06-10 Shangqing Tu , Zhuoran Pan , Wenxuan Wang , Zhexin Zhang , Yuliang Sun , Jifan Yu , Hongning Wang , Lei Hou , Juanzi Li

Aligned large language models (LLMs) remain vulnerable to jailbreak attacks. Recent mechanistic studies have identified latent features and representation shifts associated with jailbreak success, but they leave a more fundamental question…

Cryptography and Security · Computer Science 2026-05-12 Yu Chen , Yuanhao Liu , Qi Cao

Ensuring the security of large language models (LLMs) is an ongoing challenge despite their widespread popularity. Developers work to enhance LLMs security, but vulnerabilities persist, even in advanced versions like GPT-4. Attackers…

Cryptography and Security · Computer Science 2023-12-19 Aysan Esmradi , Daniel Wankit Yip , Chun Fai Chan

Although many large language models (LLMs) have been trained to refuse harmful requests, they are still vulnerable to jailbreaking attacks which rewrite the original prompt to conceal its harmful intent. In this paper, we propose a new…

Computation and Language · Computer Science 2024-06-10 Yihan Wang , Zhouxing Shi , Andrew Bai , Cho-Jui Hsieh

Large language models (LLMs) have demonstrated remarkable capabilities across diverse applications, however, they remain critically vulnerable to jailbreak attacks that elicit harmful responses violating human values and safety guidelines.…

Cryptography and Security · Computer Science 2026-01-12 Zhaoqi Wang , Zijian Zhang , Daqing He , Pengtao Kou , Xin Li , Jiamou Liu , Jincheng An , Yong Liu

Finetuning pretrained large language models (LLMs) has become the standard paradigm for developing downstream applications. However, its security implications remain unclear, particularly regarding whether finetuned LLMs inherit jailbreak…

Cryptography and Security · Computer Science 2025-12-18 Yixin Tan , Zhe Yu , Jun Sakuma

Background: Fine-tuning is central to adapting pre-trained Large Language Models (LLMs) to downstream tasks, but its reliance on training data, parameter updates, and reusable components opens entry points for attackers. Threats have…

Cryptography and Security · Computer Science 2026-05-26 Wenjuan Li , Yitao Liu , Runze Chen , Rajkumar Buyya

Large Language Models (LLMs), now a foundation in advancing natural language processing, power applications such as text generation, machine translation, and conversational systems. Despite their transformative potential, these models…

Cryptography and Security · Computer Science 2025-08-05 Kang Chen , Xiuze Zhou , Yuanguo Lin , Jinhe Su , Yuanhui Yu , Li Shen , Fan Lin

Large language models (LLMs) can still be jailbroken into producing harmful outputs despite safety alignment. Existing attacks show this vulnerability, but not the internal mechanisms that cause it. This study asks whether jailbreak success…

Computation and Language · Computer Science 2026-04-28 Nilanjana Das , Manas Gaur

Large Language Models (LLMs) have become central to numerous natural language processing tasks, but their vulnerabilities present significant security and ethical challenges. This systematic survey explores the evolving landscape of attack…

Cryptography and Security · Computer Science 2025-05-05 Zhiyu Liao , Kang Chen , Yuanguo Lin , Kangkang Li , Yunxuan Liu , Hefeng Chen , Xingwang Huang , Yuanhui Yu

Considerable research efforts have been devoted to ensuring that large language models (LLMs) align with human values and generate safe text. However, an excessive focus on sensitivity to certain topics can compromise the model's robustness…

Computation and Language · Computer Science 2023-08-29 Huachuan Qiu , Shuai Zhang , Anqi Li , Hongliang He , Zhenzhong Lan
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