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Watermarking by altering token sampling probabilities based on red-green list is a promising method for tracing the origin of text generated by large language models (LLMs). However, existing watermark methods often struggle with a…

Cryptography and Security · Computer Science 2025-05-21 Zongqi Wang , Tianle Gu , Baoyuan Wu , Yujiu Yang

We propose an imperceptible multi-bit text watermark embedded by paraphrasing with LLMs. We fine-tune a pair of LLM paraphrasers that are designed to behave differently so that their paraphrasing difference reflected in the text semantics…

Artificial Intelligence · Computer Science 2025-06-18 Xiaojun Xu , Jinghan Jia , Yuanshun Yao , Yang Liu , Hang Li

LLM watermarking, which embeds imperceptible yet algorithmically detectable signals in model outputs to identify LLM-generated text, has become crucial in mitigating the potential misuse of large language models. However, the abundance of…

Cryptography and Security · Computer Science 2024-10-29 Leyi Pan , Aiwei Liu , Zhiwei He , Zitian Gao , Xuandong Zhao , Yijian Lu , Binglin Zhou , Shuliang Liu , Xuming Hu , Lijie Wen , Irwin King , Philip S. Yu

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

Text content created by humans or language models is often stolen or misused by adversaries. Tracing text provenance can help claim the ownership of text content or identify the malicious users who distribute misleading content like…

Cryptography and Security · Computer Science 2021-12-16 Xi Yang , Jie Zhang , Kejiang Chen , Weiming Zhang , Zehua Ma , Feng Wang , Nenghai Yu

Large language models (LLMs) have witnessed a meteoric rise in popularity among the general public users over the past few months, facilitating diverse downstream tasks with human-level accuracy and proficiency. Prompts play an essential…

Multimedia · Computer Science 2023-11-29 Hongwei Yao , Jian Lou , Kui Ren , Zhan Qin

We study the problem of watermarking large language models (LLMs) generated text -- one of the most promising approaches for addressing the safety challenges of LLM usage. In this paper, we propose a rigorous theoretical framework to…

Computation and Language · Computer Science 2023-10-16 Xuandong Zhao , Prabhanjan Ananth , Lei Li , Yu-Xiang Wang

In the present-day scenario, Large Language Models (LLMs) are establishing their presence as powerful instruments permeating various sectors of society. While their utility offers valuable support to individuals, there are multiple concerns…

Computation and Language · Computer Science 2025-07-01 Badr Youbi Idrissi , Monica Millunzi , Amelia Sorrenti , Lorenzo Baraldi , Daryna Dementieva

Watermark algorithms for large language models (LLMs) have achieved extremely high accuracy in detecting text generated by LLMs. Such algorithms typically involve adding extra watermark logits to the LLM's logits at each generation step.…

Cryptography and Security · Computer Science 2024-05-21 Aiwei Liu , Leyi Pan , Xuming Hu , Shiao Meng , Lijie Wen

Embeddings-as-a-Service (EaaS) is a service offered by large language model (LLM) developers to supply embeddings generated by LLMs. Previous research suggests that EaaS is prone to imitation attacks -- attacks that clone the underlying…

Cryptography and Security · Computer Science 2025-06-03 Anudeex Shetty , Qiongkai Xu , Jey Han Lau

Watermarking LLM-generated text is critical for content attribution and misinformation prevention. However, existing methods compromise text quality, require white-box model access and logit manipulation. These limitations exclude API-based…

Computation and Language · Computer Science 2026-01-13 Zhuohao Yu , Xingru Jiang , Weizheng Gu , Yidong Wang , Qingsong Wen , Shikun Zhang , Wei Ye

Model merging is a promising lightweight model empowerment technique that does not rely on expensive computing devices (e.g., GPUs) or require the collection of specific training data. Instead, it involves editing different upstream model…

Cryptography and Security · Computer Science 2024-11-05 Tianshuo Cong , Delong Ran , Zesen Liu , Xinlei He , Jinyuan Liu , Yichen Gong , Qi Li , Anyu Wang , Xiaoyun Wang

As Large Language Models (LLMs) become increasingly sophisticated, they raise significant security concerns, including the creation of fake news and academic misuse. Most detectors for identifying model-generated text are limited by their…

Cryptography and Security · Computer Science 2024-10-10 Zhenyu Xu , Victor S. Sheng

Watermarking provides a critical safeguard for large language model (LLM) services by facilitating the detection of LLM-generated text. Correspondingly, stealing watermark algorithms (SWAs) derive watermark information from watermarked…

Cryptography and Security · Computer Science 2026-04-14 Shuhao Zhang , Yuli Chen , Jiale Han , Bo Cheng , Jiabao Ma

Most LLM fingerprinting methods teach the model to respond to a few fixed queries with predefined atypical responses (keys). This memorization often does not survive common deployment steps such as finetuning or quantization, and such keys…

Cryptography and Security · Computer Science 2026-02-20 Thibaud Gloaguen , Robin Staab , Nikola Jovanović , Martin Vechev

Training data is a critical and often proprietary asset in Large Language Model (LLM) development, motivating the use of data watermarking to embed model-transferable signals for usage verification. We identify low coverage as a vital yet…

Cryptography and Security · Computer Science 2026-04-30 Hengyu Wu , Yang Cao

We study the problem of multi-bit watermarking for large language models (LLMs). We introduce a block-autoregressive model inspired by multi-token prediction, in which the encoder has limited non-causal access to token distributions within…

Information Theory · Computer Science 2026-05-19 Sidong Guo , Tyler Kann , Teodora Baluta , Matthieu R. Bloch

In recent trends, one can observe Large Language Models (LLMs) are exposed to backdoor attacks where vicious triggers added during training or model editing to elicit harmful outputs on specific input patterns while maintaining clean…

Cryptography and Security · Computer Science 2026-05-14 Jagadeesh Rachapudi , Ritali Vatsi , Pranav Singh , Praful Hambarde , Amit Shukla

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

Recent advances in Large Language Models (LLMs) have raised urgent concerns about LLM-generated text authenticity, prompting regulatory demands for reliable identification mechanisms. Although watermarking offers a promising solution,…

Computation and Language · Computer Science 2025-08-26 Xiaoyan Feng , He Zhang , Yanjun Zhang , Leo Yu Zhang , Shirui Pan
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