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Large language models (LLMs) demonstrate remarkable capabilities across various tasks. However, their deployment introduces significant risks related to intellectual property. In this context, we focus on model stealing attacks, where…

Cryptography and Security · Computer Science 2025-10-28 Kieu Dang , Phung Lai , NhatHai Phan , Yelong Shen , Ruoming Jin , Abdallah Khreishah

Watermarking for large language models (LLMs) is a promising approach for detecting LLM-generated text and enabling responsible deployment. However, existing watermarking methods are often vulnerable to semantic-invariant attacks, such as…

Cryptography and Security · Computer Science 2026-05-26 Zhenxin Ai , Haiyun He

Detecting whether copyright holders' works were used in LLM pretraining is poised to be an important problem. This work proposes using data watermarks to enable principled detection with only black-box model access, provided that the…

Cryptography and Security · Computer Science 2024-08-20 Johnny Tian-Zheng Wei , Ryan Yixiang Wang , Robin Jia

The proliferation of large language models (LLMs) in generating content raises concerns about text copyright. Watermarking methods, particularly logit-based approaches, embed imperceptible identifiers into text to address these challenges.…

Computation and Language · Computer Science 2025-02-06 Yiyang Luo , Ke Lin , Chao Gu , Jiahui Hou , Lijie Wen , Ping Luo

With the advent of large language models (LLMs), numerous software service providers (SSPs) are dedicated to developing LLMs customized for code generation tasks, such as CodeLlama and Copilot. However, these LLMs can be leveraged by…

Cryptography and Security · Computer Science 2025-04-22 Kaiwen Ning , Jiachi Chen , Qingyuan Zhong , Tao Zhang , Yanlin Wang , Wei Li , Jingwen Zhang , Jianxing Yu , Yuming Feng , Weizhe Zhang , Zibin Zheng

This paper presents a survey and taxonomy of LLM fingerprinting and watermarking for identity, ownership verification, provenance, and generated-content attribution. Large language models (LLMs) require substantial investments in data,…

Cryptography and Security · Computer Science 2026-05-29 Bing Liu , Shunping Wang , Yufan Zhu , Xinyi Yu , Jing Huang , Linkang Du , Hongbin Pei , Wei Luo

We study statistical watermarking by formulating it as a hypothesis testing problem, a general framework which subsumes all previous statistical watermarking methods. Key to our formulation is a coupling of the output tokens and the…

Machine Learning · Computer Science 2024-02-08 Baihe Huang , Hanlin Zhu , Banghua Zhu , Kannan Ramchandran , Michael I. Jordan , Jason D. Lee , Jiantao Jiao

While watermarking serves as a critical mechanism for LLM provenance, existing secret-key schemes tightly couple detection with injection, requiring access to keys or provider-side scheme-specific detectors for verification. This dependency…

Cryptography and Security · Computer Science 2026-04-14 Zhuoshang Wang , Yubing Ren , Yanan Cao , Fang Fang , Xiaoxue Li , Li Guo

Large language models are probabilistic models, and the process of generating content is essentially sampling from the output distribution of the language model. Existing watermarking techniques inject watermarks into the generated content…

Cryptography and Security · Computer Science 2024-10-29 Zhengmian Hu , Heng Huang

This paper introduces EmMark,a novel watermarking framework for protecting the intellectual property (IP) of embedded large language models deployed on resource-constrained edge devices. To address the IP theft risks posed by malicious…

Cryptography and Security · Computer Science 2024-02-29 Ruisi Zhang , Farinaz Koushanfar

Watermarking has emerged as a crucial method to distinguish AI-generated text from human-created text. Current watermarking approaches often lack formal optimality guarantees or address the scheme and detector design separately. In this…

Cryptography and Security · Computer Science 2025-10-28 Haiyun He , Yepeng Liu , Ziqiao Wang , Yongyi Mao , Yuheng Bu

Invisible watermarking of AI-generated images can help with copyright protection, enabling detection and identification of AI-generated media. In this work, we present a novel approach to watermark images of T2I Latent Diffusion Models…

Computer Vision and Pattern Recognition · Computer Science 2025-03-18 Naresh Kumar Devulapally , Mingzhen Huang , Vishal Asnani , Shruti Agarwal , Siwei Lyu , Vishnu Suresh Lokhande

Large language models (LLMs) are increasingly integrated into real-world personalized applications through retrieval-augmented generation (RAG) mechanisms to supplement their responses with domain-specific knowledge. However, the valuable…

Cryptography and Security · Computer Science 2025-05-26 Junfeng Guo , Yiming Li , Ruibo Chen , Yihan Wu , Chenxi Liu , Yanshuo Chen , Heng Huang

Large language model (LLM) watermarking has emerged as a promising approach for detecting and attributing AI-generated text, yet its robustness to black-box spoofing remains insufficiently evaluated. Existing evaluation methods often demand…

Cryptography and Security · Computer Science 2026-04-14 Hanbo Huang , Xuan Gong , Yiran Zhang , Hao Zheng , Shiyu Liang

We present the first undetectable watermarking scheme for generative image models. Undetectability ensures that no efficient adversary can distinguish between watermarked and un-watermarked images, even after making many adaptive queries.…

Cryptography and Security · Computer Science 2025-04-23 Sam Gunn , Xuandong Zhao , Dawn Song

Watermarking techniques offer a promising way to identify machine-generated content via embedding covert information into the contents generated from language models. A challenge in the domain lies in preserving the distribution of original…

Cryptography and Security · Computer Science 2024-06-26 Yihan Wu , Zhengmian Hu , Junfeng Guo , Hongyang Zhang , Heng Huang

Watermarking has emerged as a crucial technique for detecting and attributing content generated by large language models. While recent advancements have utilized watermark ensembles to enhance robustness, prevailing methods typically…

Cryptography and Security · Computer Science 2026-02-13 Ruibo Chen , Yihan Wu , Xuehao Cui , Jingqi Zhang , Heng Huang

As large language models (LLMs) reach human-like fluency, reliably distinguishing AI-generated text from human authorship becomes increasingly difficult. While watermarks already exist for LLMs, they often lack flexibility and struggle with…

Computation and Language · Computer Science 2025-06-18 Georg Niess , Roman Kern

In this paper, we propose a new decoding method called Permute-and-Flip (PF) decoder. It enjoys stability properties similar to the standard sampling decoder, but is provably up to 2x better in its quality-stability tradeoff than sampling…

Computation and Language · Computer Science 2025-03-18 Xuandong Zhao , Lei Li , Yu-Xiang Wang

Text watermarking plays a crucial role in ensuring the traceability and accountability of large language model (LLM) outputs and mitigating misuse. While promising, most existing methods assume perfect pseudorandomness. In practice,…

Statistics Theory · Mathematics 2026-01-21 T. Tony Cai , Xiang Li , Qi Long , Weijie J. Su , Garrett G. Wen
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