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We investigate the radioactivity of text generated by large language models (LLM), i.e. whether it is possible to detect that such synthetic input was used to train a subsequent LLM. Current methods like membership inference or active IP…

Cryptography and Security · Computer Science 2024-10-29 Tom Sander , Pierre Fernandez , Alain Durmus , Matthijs Douze , Teddy Furon

Large Language Models (LLMs) show remarkable capabilities in understanding natural language and generating complex code. However, as practitioners adopt CodeLLMs for increasingly critical development tasks, research reveals that these…

Cryptography and Security · Computer Science 2026-03-13 Maximilian Wendlinger , Daniel Kowatsch , Konstantin Böttinger , Philip Sperl

Watermarking has emerged as a promising technique for detecting texts generated by LLMs. Current research has primarily focused on three design criteria: high quality of the watermarked text, high detectability, and robustness against…

Cryptography and Security · Computer Science 2025-04-11 Li An , Yujian Liu , Yepeng Liu , Yang Zhang , Yuheng Bu , Shiyu Chang

Motivated by the problem of detecting AI-generated text, we consider the problem of watermarking the output of language models with provable guarantees. We aim for watermarks which satisfy: (a) undetectability, a cryptographic notion…

Cryptography and Security · Computer Science 2025-05-29 Noah Golowich , Ankur Moitra

Text watermarks for large language models (LLMs) have been commonly used to identify the origins of machine-generated content, which is promising for assessing liability when combating deepfake or harmful content. While existing…

Cryptography and Security · Computer Science 2024-10-30 Tong Zhou , Xuandong Zhao , Xiaolin Xu , Shaolei Ren

Detecting machine-generated text is essential for transparency and accountability when deploying large language models (LLMs). Among detection approaches, watermarking is a statistically reliable method by design -- it embeds detectable…

Computation and Language · Computer Science 2026-05-05 Koshiro Saito , Ryuto Koike , Masahiro Kaneko , Naoaki Okazaki

Large pre-trained language models (PLMs) have proven to be a crucial component of modern natural language processing systems. PLMs typically need to be fine-tuned on task-specific downstream datasets, which makes it hard to claim the…

Computation and Language · Computer Science 2023-02-13 Chenxi Gu , Chengsong Huang , Xiaoqing Zheng , Kai-Wei Chang , Cho-Jui Hsieh

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

Large language model (LLM) watermarks enable authentication of text provenance, curb misuse of machine-generated text, and promote trust in AI systems. Current watermarks operate by changing the next-token predictions output by an LLM. The…

Cryptography and Security · Computer Science 2025-12-03 Dor Tsur , Carol Xuan Long , Claudio Mayrink Verdun , Hsiang Hsu , Chen-Fu Chen , Haim Permuter , Sajani Vithana , Flavio P. Calmon

Recent advancements in watermarking techniques have enabled the embedding of secret messages into AI-generated text (AIGT), serving as an important mechanism for AIGT detection. Existing methods typically interfere with the generation…

Cryptography and Security · Computer Science 2025-06-10 Peiru Yang , Xintian Li , Wanchun Ni , Jinhua Yin , Huili Wang , Guoshun Nan , Shangguang Wang , Yongfeng Huang , Tao Qi

To support various applications, a prevalent and efficient approach for business owners is leveraging their valuable datasets to fine-tune a pre-trained LLM through the API provided by LLM owners or cloud servers. However, this process…

Cryptography and Security · Computer Science 2024-06-06 Shen Li , Liuyi Yao , Jinyang Gao , Lan Zhang , Yaliang Li

The integrity of peer review is fundamental to scientific progress, but the rise of large language models (LLMs) has introduced concerns that some reviewers may rely on these tools to generate reviews rather than writing them independently.…

Digital Libraries · Computer Science 2026-03-13 Vishisht Rao , Aounon Kumar , Himabindu Lakkaraju , Nihar B. Shah

The rapid spread of text generated by large language models (LLMs) makes it increasingly difficult to distinguish authentic human writing from machine output. Watermarking offers a promising solution: model owners can embed an imperceptible…

Cryptography and Security · Computer Science 2025-11-04 Shingo Kodama , Haya Diwan , Lucas Rosenblatt , R. Teal Witter , Niv Cohen

Watermarking has emerged as a promising way to detect LLM-generated text, by augmenting LLM generations with later detectable signals. Recent work has proposed multiple families of watermarking schemes, several of which focus on preserving…

Cryptography and Security · Computer Science 2025-02-25 Thibaud Gloaguen , Nikola Jovanović , Robin Staab , Martin Vechev

Efficient knowledge injection methods for Large Language Models (LLMs), such as In-Context Learning, knowledge editing, and efficient parameter fine-tuning, significantly enhance model utility on downstream tasks. However, they also pose…

Cryptography and Security · Computer Science 2026-01-23 Ziwei Zhang , Juan Wen , Wanli Peng , Zhengxian Wu , Yinghan Zhou , Yiming Xue

In recent times, large language models (LLMs) have made significant strides in generating computer code, blurring the lines between code created by humans and code produced by artificial intelligence (AI). As these technologies evolve…

Machine Learning · Computer Science 2024-07-04 Marc Oedingen , Raphael C. Engelhardt , Robin Denz , Maximilian Hammer , Wolfgang Konen

As open-source large language models (LLMs) like Llama3 become more capable, it is crucial to develop watermarking techniques to detect their potential misuse. Existing watermarking methods either add watermarks during LLM inference, which…

Computation and Language · Computer Science 2025-03-18 Yijie Xu , Aiwei Liu , Xuming Hu , Lijie Wen , Hui Xiong

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

Watermarking enables GenAI providers to verify whether content was generated by their models. A watermark is a hidden signal in the content, whose presence can be detected using a secret watermark key. A core security threat are forgery…

Cryptography and Security · Computer Science 2026-05-12 Toluwani Aremu , Noor Hussein , Munachiso Nwadike , Samuele Poppi , Jie Zhang , Karthik Nandakumar , Neil Gong , Nils Lukas

The rapid advancement of large language models (LLMs) has made it increasingly difficult to distinguish between text written by humans and machines. Addressing this, we propose a novel method for generating watermarks that strategically…

Computation and Language · Computer Science 2024-05-15 Georg Niess , Roman Kern