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Large language models (LLMs) have achieved widespread adoption across numerous applications. However, many LLMs are vulnerable to malicious attacks even after safety alignment. These attacks typically bypass LLMs' safety guardrails by…

Cryptography and Security · Computer Science 2025-06-17 Yucheng Li , Surin Ahn , Huiqiang Jiang , Amir H. Abdi , Yuqing Yang , Lili Qiu

Large Language Model-based systems (LLM systems) are information and query processing systems that use LLMs to plan operations from natural-language prompts and feed the output of each successive step into the LLM to plan the next. This…

Cryptography and Security · Computer Science 2024-10-11 Fangzhou Wu , Ethan Cecchetti , Chaowei Xiao

Prompt injection attacks represent a major vulnerability in Large Language Model (LLM) deployments, where malicious instructions embedded in user inputs can override system prompts and induce unintended behaviors. This paper presents a…

Cryptography and Security · Computer Science 2025-12-18 S M Asif Hossain , Ruksat Khan Shayoni , Mohd Ruhul Ameen , Akif Islam , M. F. Mridha , Jungpil Shin

Large Language Models (LLMs) remain susceptible to jailbreak exploits that bypass safety filters and induce harmful or unethical behavior. This work presents a systematic taxonomy of existing jailbreak defenses across prompt-level,…

Cryptography and Security · Computer Science 2025-11-25 Ryan Wong , Hosea David Yu Fei Ng , Dhananjai Sharma , Glenn Jun Jie Ng , Kavishvaran Srinivasan

Recent advances in Large Language Models (LLMs) enable exciting LLM-integrated applications, which perform text-based tasks by utilizing their advanced language understanding capabilities. However, as LLMs have improved, so have the attacks…

Cryptography and Security · Computer Science 2024-09-27 Sizhe Chen , Julien Piet , Chawin Sitawarin , David Wagner

Large Language Model (LLM) agents are increasingly used to automate complex workflows, but integrating untrusted external data with privileged execution exposes them to severe security risks, particularly direct and indirect prompt…

Cryptography and Security · Computer Science 2026-04-28 Zonghao Ying , Haozheng Wang , Jiangfan Liu , Quanchen Zou , Aishan Liu , Jian Yang , Yaodong Yang , Xianglong Liu

Prompt injection attacks pose a pervasive threat to the security of Large Language Models (LLMs). State-of-the-art prevention-based defenses typically rely on fine-tuning an LLM to enhance its security, but they achieve limited…

Cryptography and Security · Computer Science 2025-11-17 Yupei Liu , Yanting Wang , Yuqi Jia , Jinyuan Jia , Neil Zhenqiang Gong

Large Language Models (LLMs) are widely deployed in real-world systems. Given their broader applicability, prompt engineering has become an efficient tool for resource-scarce organizations to adopt LLMs for their own purposes. At the same…

Cryptography and Security · Computer Science 2026-02-27 Piyush Jaiswal , Aaditya Pratap , Shreyansh Saraswati , Harsh Kasyap , Somanath Tripathy

As Large Language Models (LLMs) grow increasingly powerful, multi-agent systems are becoming more prevalent in modern AI applications. Most safety research, however, has focused on vulnerabilities in single-agent LLMs. These include prompt…

Multiagent Systems · Computer Science 2024-10-11 Donghyun Lee , Mo Tiwari

Natural language interfaces to structured databases are becoming increasingly common, largely due to advances in large language models (LLMs) that enable users to query data using conversational input rather than formal query languages such…

Cryptography and Security · Computer Science 2026-05-12 Farzad Nourmohammadzadeh Motlagh , Mehrdad Hajizadeh , Mehryar Majd , Pejman Najafi , Feng Cheng , Christoph Meinel

Prompt injection attacks, where untrusted data contains an injected prompt to manipulate the system, have been listed as the top security threat to LLM-integrated applications. Model-level prompt injection defenses have shown strong…

Cryptography and Security · Computer Science 2026-02-09 Sizhe Chen , Arman Zharmagambetov , David Wagner , Chuan Guo

Large language models (LLMs) have demonstrated impressive performance and have come to dominate the field of natural language processing (NLP) across various tasks. However, due to their strong instruction-following capabilities and…

Cryptography and Security · Computer Science 2026-04-10 Yulin Chen , Haoran Li , Yuan Sui , Yue Liu , Yufei He , Xiaoling Bai , Chi Fei , Yabo Li , Haozhe Ma , Yangqiu Song , Bryan Hooi

Large Language Models (LLMs) are increasingly central to agentic systems due to their strong reasoning and planning capabilities. By interacting with external environments through predefined tools, these agents can carry out complex user…

Cryptography and Security · Computer Science 2026-03-27 Hao Li , Xiaogeng Liu , Hung-Chun Chiu , Dianqi Li , Ning Zhang , Chaowei Xiao

Large Language Models (LLMs) are attracting significant research attention due to their instruction-following abilities, allowing users and developers to leverage LLMs for a variety of tasks. However, LLMs are vulnerable to prompt-injection…

Cryptography and Security · Computer Science 2024-01-10 Julien Piet , Maha Alrashed , Chawin Sitawarin , Sizhe Chen , Zeming Wei , Elizabeth Sun , Basel Alomair , David Wagner

As LLM agents transition from digital assistants to physical controllers in autonomous systems and robotics, they face an escalating threat from indirect prompt injection. By embedding adversarial instructions into the results of tool…

Artificial Intelligence · Computer Science 2026-01-09 Qiang Yu , Xinran Cheng , Chuanyi Liu

Large Language Models (LLMs) are deployed in interactive contexts with direct user engagement, such as chatbots and writing assistants. These deployments are vulnerable to prompt injection and jailbreaking (collectively, prompt hacking), in…

Large Language Models (LLMs) are increasingly integrated into real-world applications, from virtual assistants to autonomous agents. However, their flexibility also introduces new attack vectors-particularly Prompt Injection (PI), where…

Cryptography and Security · Computer Science 2025-09-17 Mengxiao Wang , Yuxuan Zhang , Guofei Gu

Large language model (LLM)-integrated applications have become increasingly prevalent, yet face critical security vulnerabilities from prompt injection (PI) attacks. Defending against PI attacks faces two major issues: malicious…

Artificial Intelligence · Computer Science 2026-04-10 Zhiyuan Chang , Mingyang Li , Yuekai Huang , Ziyou Jiang , Xiaojun Jia , Qian Xiong , Junjie Wang , Zhaoyang Li , Qing Wang

Despite their potential, recent research has demonstrated that LLM agents are vulnerable to prompt injection attacks, where malicious prompts are injected into the agent's input, causing it to perform an attacker-specified task rather than…

Large language models (LLMs) are increasingly being harnessed to automate cyberattacks, making sophisticated exploits more accessible and scalable. In response, we propose a new defense strategy tailored to counter LLM-driven cyberattacks.…

Cryptography and Security · Computer Science 2024-11-19 Dario Pasquini , Evgenios M. Kornaropoulos , Giuseppe Ateniese