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Recent AI systems combine large language models with tools, external knowledge via retrieval-augmented generation (RAG), and even autonomous multi-agent decision loops. This agentic AI paradigm greatly expands capabilities - but also vastly…

Cryptography and Security · Computer Science 2026-03-25 Ali Dehghantanha , Sajad Homayoun

Large language model (LLM) based agents are increasingly used to automate financial transactions, yet their reliance on contextual reasoning exposes payment systems to prompt-driven manipulation. The Agent Payments Protocol (AP2) aims to…

Cryptography and Security · Computer Science 2026-05-20 Tanusree Debi , Wentian Zhu , Pranjol Sen Gupta

Large language model (LLM) based web agents are increasingly deployed to automate complex online tasks by directly interacting with web sites and performing actions on users' behalf. While these agents offer powerful capabilities, their…

Cryptography and Security · Computer Science 2026-02-11 Georgios Syros , Evan Rose , Brian Grinstead , Christoph Kerschbaumer , William Robertson , Cristina Nita-Rotaru , Alina Oprea

The Model Context Protocol (MCP), introduced by Anthropic in November 2024 and now governed by the Linux Foundation's Agentic AI Foundation, has rapidly become the de facto standard for connecting large language model (LLM)-based agents to…

Cryptography and Security · Computer Science 2026-04-08 Nirajan Acharya , Gaurav Kumar Gupta

This work demonstrates that LLM-based web navigation agents offer powerful automation capabilities but are vulnerable to Indirect Prompt Injection (IPI) attacks. We show that adversaries can embed universal adversarial triggers in webpage…

Cryptography and Security · Computer Science 2025-07-22 Sam Johnson , Viet Pham , Thai Le

The evolution of Large Language Models (LLMs) into Agentic AI has established the Model Context Protocol (MCP) as the standard for connecting reasoning engines with external tools. Although this decoupled architecture fosters modularity, it…

Cryptography and Security · Computer Science 2026-02-17 Yunhao Yao , Zhiqiang Wang , Haoran Cheng , Yihang Cheng , Haohua Du , Xiang-Yang Li

Large language models (LLMs) are increasingly deployed as educational agents for automatic short answer grading (ASAG) in real-world educational environments, significantly boosting assessment efficiency and scalability. However, when these…

Cryptography and Security · Computer Science 2026-05-25 Xueyi Li , Zhuoneng Zhou , Zitao Liu , Yongdong Wu

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

Prompt injection is listed as the number-one vulnerability class in the OWASP Top 10 for LLM Applications that can subvert LLM guardrails, disclose sensitive data, and trigger unauthorized tool use. Developers are rapidly adopting…

Cryptography and Security · Computer Science 2026-03-24 Charoes Huang , Xin Huang , Amin Milani Fard

Prompt injection attacks pose a significant challenge to the safe deployment of Large Language Models (LLMs) in real-world applications. While prompt-based detection offers a lightweight and interpretable defense strategy, its effectiveness…

Cryptography and Security · Computer Science 2025-10-10 Ting-Chun Liu , Ching-Yu Hsu , Kuan-Yi Lee , Chi-An Fu , Hung-yi Lee

Prompt injection attacks, where malicious input is designed to manipulate AI systems into ignoring their original instructions and following unauthorized commands instead, were first discovered by Preamble, Inc. in May 2022 and responsibly…

Cryptography and Security · Computer Science 2025-07-18 Jeremy McHugh , Kristina Šekrst , Jon Cefalu

Modern AI agents execute real-world side effects through tool calls such as file operations, shell commands, HTTP requests, and database queries. A single unsafe action, including accidental deletion, credential exposure, or data…

Artificial Intelligence · Computer Science 2026-05-07 Chenglin Yang

Large Language Models (LLMs) are increasingly equipped with capabilities of real-time web search and integrated with protocols like Model Context Protocol (MCP). This extension could introduce new security vulnerabilities. We present a…

Cryptography and Security · Computer Science 2025-05-23 Junjie Xiong , Changjia Zhu , Shuhang Lin , Chong Zhang , Yongfeng Zhang , Yao Liu , Lingyao Li

Following the advancement of large language models (LLMs), the development of LLM-based autonomous agents has become increasingly prevalent. As a result, the need to understand the security vulnerabilities of these agents has become a…

Cryptography and Security · Computer Science 2024-10-23 Itay Nakash , George Kour , Guy Uziel , Ateret Anaby-Tavor

Large Language Models (LLMs) have shown significant promise in real-world decision-making tasks for embodied artificial intelligence, especially when fine-tuned to leverage their inherent common sense and reasoning abilities while being…

Cryptography and Security · Computer Science 2025-05-01 Ruochen Jiao , Shaoyuan Xie , Justin Yue , Takami Sato , Lixu Wang , Yixuan Wang , Qi Alfred Chen , Qi Zhu

With the emergence of more powerful large language models (LLMs), such as ChatGPT and GPT-4, in-context learning (ICL) has gained significant prominence in leveraging these models for specific tasks by utilizing data-label pairs as…

Computation and Language · Computer Science 2023-10-17 Jiongxiao Wang , Zichen Liu , Keun Hee Park , Zhuojun Jiang , Zhaoheng Zheng , Zhuofeng Wu , Muhao Chen , Chaowei Xiao

AI agents equipped with tool-calling capabilities are susceptible to Indirect Prompt Injection (IPI) attacks. In this attack scenario, malicious commands hidden within untrusted content trick the agent into performing unauthorized actions.…

Cryptography and Security · Computer Science 2026-02-10 Minbeom Kim , Mihir Parmar , Phillip Wallis , Lesly Miculicich , Kyomin Jung , Krishnamurthy Dj Dvijotham , Long T. Le , Tomas Pfister

Prompt injection constitutes a significant challenge for generative AI systems by inducing unintended outputs. We introduce a multi-agent NLP framework specifically designed to address prompt injection vulnerabilities through layered…

Artificial Intelligence · Computer Science 2025-03-17 Diego Gosmar , Deborah A. Dahl , Dario Gosmar

Large language model (LLM)-based agents combine LLMs with external tools to automate tasks such as scheduling meetings, managing documents, or booking travel. While these integrations unlock powerful capabilities, they also create new and…

Cryptography and Security · Computer Science 2026-04-22 Jonathan Evertz , Merlin Chlosta , Lea Schönherr , Thorsten Eisenhofer

The widespread adoption of Large Language Models (LLMs) has revolutionized AI deployment, enabling autonomous and semi-autonomous applications across industries through intuitive language interfaces and continuous improvements in model…

Cryptography and Security · Computer Science 2025-10-20 Adam Swanda , Amy Chang , Alexander Chen , Fraser Burch , Paul Kassianik , Konstantin Berlin