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To foster trustworthy Artificial Intelligence (AI) within the European Union, the AI Act requires providers to mark and detect the outputs of their general-purpose models. The Article 50 and Recital 133 call for marking methods that are…

Cryptography and Security · Computer Science 2025-11-06 Thomas Souverain

Watermarking is a key technique for detecting AI-generated text. In this work, we study its vulnerabilities and introduce the Smoothing Attack, a novel watermark removal method. By leveraging the relationship between the model's confidence…

Machine Learning · Computer Science 2025-02-06 Hongyan Chang , Hamed Hassani , Reza Shokri

We demonstrate that while the current approaches for language model watermarking are effective for open-ended generation, they are inadequate at watermarking LM outputs for constrained generation tasks with low-entropy output spaces.…

Cryptography and Security · Computer Science 2026-01-21 Nghia T. Le , Alan Ritter , Kartik Goyal

Logit-based LLM watermarking traces and verifies AI-generated content by maintaining green and red token lists and increasing the likelihood of green tokens during generation. However, it fails in low-entropy scenarios, where predictable…

Computation and Language · Computer Science 2025-05-21 Tianle Gu , Zongqi Wang , Kexin Huang , Yuanqi Yao , Xiangliang Zhang , Yujiu Yang , Xiuying Chen

The growing use of large language models (LLMs) for sensitive applications has highlighted the need for effective watermarking techniques to ensure the provenance and accountability of AI-generated text. However, most existing watermarking…

Computation and Language · Computer Science 2026-04-07 Yepeng Liu , Xuandong Zhao , Christopher Kruegel , Dawn Song , Yuheng Bu

Watermarking has recently emerged as an effective strategy for detecting the outputs of large language models (LLMs). Most existing schemes require white-box access to the model's next-token probability distribution, which is typically not…

Cryptography and Security · Computer Science 2026-02-24 Dara Bahri , John Wieting

Digital watermarking is a promising solution for mitigating some of the risks arising from the misuse of automatically generated text. These approaches either embed non-specific watermarks to allow for the detection of any text generated by…

Cryptography and Security · Computer Science 2025-06-23 Zihao Fu , Chris Russell

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

Recent advances in the capabilities of large language models such as GPT-4 have spurred increasing concern about our ability to detect AI-generated text. Prior works have suggested methods of embedding watermarks in model outputs, by…

Cryptography and Security · Computer Science 2023-06-16 Miranda Christ , Sam Gunn , Or Zamir

LLM watermarks stand out as a promising way to attribute ownership of LLM-generated text. One threat to watermark credibility comes from spoofing attacks, where an unauthorized third party forges the watermark, enabling it to falsely…

Cryptography and Security · Computer Science 2025-05-23 Thibaud Gloaguen , Nikola Jovanović , Robin Staab , Martin Vechev

Diffusion large language models (dLLMs) offer faster generation than autoregressive models while maintaining comparable quality, but existing watermarking methods fail on them due to their non-sequential decoding. Unlike autoregressive…

Machine Learning · Computer Science 2025-10-06 Linyu Wu , Linhao Zhong , Wenjie Qu , Yuexin Li , Yue Liu , Shengfang Zhai , Chunhua Shen , Jiaheng Zhang

Watermarking techniques for large language models (LLMs), which encode hidden information in the output so its source can be verified, have gained significant attention in recent days, thanks to their potential capability to detect…

Computer Science and Game Theory · Computer Science 2026-05-15 Juho Kim , Fei Fang , Tuomas Sandholm

The rapid advancement of customized Large Language Models (LLMs) offers considerable convenience. However, it also intensifies concerns regarding the protection of copyright/confidential information. With the extensive adoption of private…

Cryptography and Security · Computer Science 2024-12-18 Yuehan Zhang , Peizhuo Lv , Yinpeng Liu , Yongqiang Ma , Wei Lu , Xiaofeng Wang , Xiaozhong Liu , Jiawei Liu

Large Language Model (LLM) watermarking embeds detectable signals into generated text for copyright protection, misuse prevention, and content detection. While prior studies evaluate robustness using watermark removal attacks, these methods…

Cryptography and Security · Computer Science 2025-09-16 Zhaoxi Zhang , Xiaomei Zhang , Yanjun Zhang , He Zhang , Shirui Pan , Bo Liu , Asif Qumer Gill , Leo Yu Zhang

Generative images have proliferated on Web platforms in social media and online copyright distribution scenarios, and semantic watermarking has increasingly been integrated into diffusion models to support reliable provenance tracking and…

Machine Learning · Computer Science 2026-02-26 Zheng Gao , Xiaoyu Li , Zhicheng Bao , Xiaoyan Feng , Jiaojiao Jiang

As the outputs of generative AI (GenAI) techniques improve in quality, it becomes increasingly challenging to distinguish them from human-created content. Watermarking schemes are a promising approach to address the problem of…

As large language models (LLMs) are increasingly deployed for text generation, watermarking has become essential for authorship attribution, intellectual property protection, and misuse detection. While existing watermarking methods perform…

Computation and Language · Computer Science 2026-01-09 Amit Bin Tariqul , A N M Zahid Hossain Milkan , Sahab-Al-Chowdhury , Syed Rifat Raiyan , Hasan Mahmud , Md Kamrul Hasan

To mitigate the potential misuse of large language models (LLMs), recent research has developed watermarking algorithms, which restrict the generation process to leave an invisible trace for watermark detection. Due to the two-stage nature…

Computation and Language · Computer Science 2024-07-02 Shangqing Tu , Yuliang Sun , Yushi Bai , Jifan Yu , Lei Hou , Juanzi Li

Recent watermarked generation algorithms inject detectable signatures during language generation to facilitate post-hoc detection. While token-level watermarks are vulnerable to paraphrase attacks, SemStamp (Hou et al., 2023) applies…

Computation and Language · Computer Science 2024-06-11 Abe Bohan Hou , Jingyu Zhang , Yichen Wang , Daniel Khashabi , Tianxing He

In this paper, we investigate the recent state-of-the-art schemes for watermarking large language models (LLMs) outputs. These techniques are claimed to be robust, scalable and production-grade, aimed at promoting responsible usage of LLMs.…

Cryptography and Security · Computer Science 2026-05-11 Jonathan Hong Jin Ng , Anh Tu Ngo , Anupam Chattopadhyay