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Backdoor attacks pose a serious threat to the secure deployment of large language models (LLMs), enabling adversaries to implant hidden behaviors triggered by specific inputs. However, existing methods often rely on manually crafted…

Cryptography and Security · Computer Science 2025-11-24 Yige Li , Zhe Li , Wei Zhao , Nay Myat Min , Hanxun Huang , Xingjun Ma , Jun Sun

The prompt-based learning paradigm, which bridges the gap between pre-training and fine-tuning, achieves state-of-the-art performance on several NLP tasks, particularly in few-shot settings. Despite being widely applied, prompt-based…

Computation and Language · Computer Science 2024-02-05 Shuai Zhao , Jinming Wen , Luu Anh Tuan , Junbo Zhao , Jie Fu

Prompt engineering has emerged as a powerful technique for optimizing large language models (LLMs) for specific applications, enabling faster prototyping and improved performance, and giving rise to the interest of the community in…

Artificial Intelligence · Computer Science 2025-02-17 Roman Levin , Valeriia Cherepanova , Abhimanyu Hans , Avi Schwarzschild , Tom Goldstein

The safety and robustness of large language models (LLMs) based applications remain critical challenges in artificial intelligence. Among the key threats to these applications are prompt hacking attacks, which can significantly undermine…

Cryptography and Security · Computer Science 2024-10-21 Baha Rababah , Shang , Wu , Matthew Kwiatkowski , Carson Leung , Cuneyt Gurcan Akcora

Large language models (LLMs) are increasingly used as analyst assistants in security operations centers (SOCs), where they ingest log and alert data to produce triage labels, incident summaries, or remediation advice. We study a structural…

Cryptography and Security · Computer Science 2026-05-26 Rohan Pandey , Archit Bhujang

Large language models (LLMs) and their applications, such as agents, are highly vulnerable to prompt injection attacks. State-of-the-art prompt injection detection methods have the following limitations: (1) their effectiveness degrades…

Cryptography and Security · Computer Science 2026-04-02 Yanting Wang , Wei Zou , Runpeng Geng , Jinyuan Jia

In-context learning (ICL) has emerged as a powerful paradigm leveraging LLMs for specific downstream tasks by utilizing labeled examples as demonstrations (demos) in the preconditioned prompts. Despite its promising performance, crafted…

Machine Learning · Computer Science 2025-05-30 Xiangyu Zhou , Yao Qiang , Saleh Zare Zade , Prashant Khanduri , Dongxiao Zhu

System prompts are critical for guiding the behavior of Large Language Models (LLMs), yet they often contain proprietary logic or sensitive information, making them a prime target for extraction attacks. Adversarial queries can successfully…

Cryptography and Security · Computer Science 2026-02-03 Huseein Jawad , Nicolas Brunel

Large Language Models (LLMs) are increasingly used to generate dynamic dialogue for game NPCs. However, their integration raises new security concerns. In this study, we examine whether adversarial prompt injection can cause LLM-based NPCs…

Cryptography and Security · Computer Science 2025-08-28 Kyohei Shiomi , Zhuotao Lian , Toru Nakanishi , Teruaki Kitasuka

The ongoing intense discussion on rising LLM usage in the scientific peer-review process has recently been mingled by reports of authors using hidden prompt injections to manipulate review scores. Since the existence of such "attacks" -…

Machine Learning · Computer Science 2025-09-26 Janis Keuper

Since the official release of ChatGPT in 2022, large language models (LLMs) have rapidly evolved from chatbot-style interfaces into agentic systems that can delegate work through tools and newly spawned subagents. While these capabilities…

Cryptography and Security · Computer Science 2026-05-12 Ziwen Cai , Yihe Zhang , Xiali Hei

LLM-powered agents often use prompt compression to reduce inference costs, but this introduces a new security risk. Compression modules, which are optimized for efficiency rather than safety, can be manipulated by adversarial inputs,…

Cryptography and Security · Computer Science 2025-11-18 Zesen Liu , Zhixiang Zhang , Yuchong Xie , Dongdong She

Autonomous coding agents are increasingly integrated into software development workflows, offering capabilities that extend beyond code suggestion to active system interaction and environment management. OpenClaw, a representative platform…

Cryptography and Security · Computer Science 2026-03-23 Fazhong Liu , Zhuoyan Chen , Tu Lan , Haozhen Tan , Zhenyu Xu , Xiang Li , Guoxing Chen , Yan Meng , Haojin Zhu

Prompts have significantly improved the performance of pretrained Large Language Models (LLMs) on various downstream tasks recently, making them increasingly indispensable for a diverse range of LLM application scenarios. However, the…

Computation and Language · Computer Science 2023-12-19 Hongwei Yao , Jian Lou , Zhan Qin

Large Language Models (LLMs) guardrail systems are designed to protect against prompt injection and jailbreak attacks. However, they remain vulnerable to evasion techniques. We demonstrate two approaches for bypassing LLM prompt injection…

Cryptography and Security · Computer Science 2025-07-15 William Hackett , Lewis Birch , Stefan Trawicki , Neeraj Suri , Peter Garraghan

The system prompt in Large Language Models (LLMs) plays a pivotal role in guiding model behavior and response generation. Often containing private configuration details, user roles, and operational instructions, the system prompt has become…

Cryptography and Security · Computer Science 2025-06-02 Badhan Chandra Das , M. Hadi Amini , Yanzhao Wu

Prompt injection attacks have become an increasing vulnerability for LLM applications, where adversarial prompts exploit indirect input channels such as emails or user-generated content to circumvent alignment safeguards and induce harmful…

Cryptography and Security · Computer Science 2026-01-21 Anirudh Sekar , Mrinal Agarwal , Rachel Sharma , Akitsugu Tanaka , Jasmine Zhang , Arjun Damerla , Kevin Zhu

Agent skills introduce a new and more severe form of indirect injection for LLM agents: unlike traditional indirect prompt injection, attackers can hide malicious instructions inside a dense, action-oriented skill that already functions as…

Cryptography and Security · Computer Science 2026-04-28 Wenjie Xiao , Xuehai Tang , Biyu Zhou , Songlin Hu , Jizhong Han

Web agents have emerged as an effective paradigm for automating interactions with complex web environments, yet remain vulnerable to prompt injection attacks that embed malicious instructions into webpage content to induce unintended…

Cryptography and Security · Computer Science 2026-04-29 Mengyao Du , Han Fang , Haokai Ma , Jiahao Chen , Kai Xu , Quanjun Yin , Ee-Chien Chang

Enterprise penetration-testing is often limited by high operational costs and the scarcity of human expertise. This paper investigates the feasibility and effectiveness of using Large Language Model (LLM)-driven autonomous systems to…

Cryptography and Security · Computer Science 2025-09-12 Andreas Happe , Jürgen Cito