| Challenge: | Unbiased watermarks allow to distinguish between text generated by humans and machines without causing distortion. |
| Approach: | They introduce a family of unbiased, Multi-Channel-based watermarks that partition the language model into segments and promote token probabilities within a selected segment based on a watermark key. |
| Outcome: | The proposed watermarks preserve the original distribution of the language model and offer significant improvements in detectability and robustness over existing unbiased watermark systems. |
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Watermarking Large Language Models: An Unbiased and Low-risk Method (2025.acl-long)
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| Challenge: | Recent advances in large language models (LLMs) have highlighted the risk of misusing them, raising the need for accurate detection of LLM-generated content. |
| Approach: | They propose a method to inject imperceptible identifiers into large language models (LLMs) this method is unbiased and preserves the original token distribution in expectation . |
| Outcome: | The proposed method preserves the original token distribution in expectation and has lower risk of producing unsatisfactory outputs in low-entropy scenarios compared to existing unbiased watermarks. |
SimMark: A Robust Sentence-Level Similarity-Based Watermarking Algorithm for Large Language Models (2025.emnlp-main)
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| Challenge: | Experimental results demonstrate that SimMark surpasses previous sentence-level watermarking techniques in robustness, sampling efficiency, and applicability across diverse domains. |
| Approach: | They propose a sentence-level watermarking algorithm that makes LLM outputs traceable without requiring access to model internals. |
| Outcome: | The proposed algorithm surpasses previous sentence-level watermarking techniques in robustness, sampling efficiency, and applicability across diverse domains while maintaining the text quality and fluency. |
XMark: Reliable Multi-Bit Watermarking for LLM-Generated Texts (2026.acl-long)
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| Challenge: | Existing methods for embedding binary messages into LLM-generated text suffer from key limitations, such as a poor trade-off between text quality and decoding accuracy. |
| Approach: | They propose a method for embedding binary messages into Large Language Model (LLM)-generated text that uses a limited number of tokens to decode and recover the encoded message. |
| Outcome: | The proposed method significantly outperforms existing methods in multiple downstream tasks and will be made publicly available upon acceptance. |
Topic-Based Watermarks for Large Language Models (2026.findings-acl)
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| Challenge: | Existing watermarking methods often involve trade-offs between attack robustness, generation quality and additional overhead. |
| Approach: | They propose a topic-guided watermarking scheme that partitions the vocabulary into topic-aligned token subsets. |
| Outcome: | The proposed method achieves text quality comparable to industry-leading systems and improves watermark robustness against paraphrasing and lexical perturbation attacks with minimal performance overhead. |
Advancing Beyond Identification: Multi-bit Watermark for Large Language Models (2024.naacl-long)
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| Challenge: | Existing methods to detect machine-generated text focus on detection, but some misuses require tracing the adversary user for counteracting them. |
| Approach: | They propose a method for embedding traceable multi-bit information during language model generation. |
| Outcome: | The proposed method outperforms existing methods in terms of robustness and latency while maintaining text quality. |
Subtle Signatures, Strong Shields: Advancing Robust and Imperceptible Watermarking in Large Language Models (2024.findings-acl)
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| Challenge: | Large Language Models (LLMs) have led to an increase in AI-generated text on the Internet, presenting a crucial challenge to differentiate AI-created content from human-written text. |
| Approach: | They propose a novel approach to embed watermarks into LLMs that leverages token prior probabilities to improve detectability and maintain watermark imperceptibility. |
| Outcome: | The proposed method improves detectability and imperceptibility of watermarks by partitioning tokens into two distinct groups based on prior probabilities and employing tailored strategies for each group. |
CodeIP: A Grammar-Guided Multi-Bit Watermark for Large Language Models of Code (2024.findings-emnlp)
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| Challenge: | Large Language Models (LLMs) have shown significant potential in code generation, but they also present challenges regarding the protection of Intellectual Property (IP) related to model architectures, weights, and training data. |
| Approach: | They propose a multi-bit watermarking technique that embeds additional information to preserve provenance details, such as the vendor ID of an LLM. |
| Outcome: | The proposed technique preserves provenance details while maintaining syntactical correctness of generated code. |
Where Am I From? Identifying Origin of LLM-generated Content (2024.emnlp-main)
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| Challenge: | Generative models have produced high-quality content, but they pose security risks . a new framework for deep learning systems enables the tracing of AI-generated content back to its source . |
| Approach: | They propose a digital forensics framework that embeds a secret watermark into the generated output and a "depth watermark" this watermark strengthens the link between content and generator, enabling accurate tracing while maintaining the quality of the generated content. |
| Outcome: | The proposed framework ensures accurate tracing while maintaining quality of generated content. |
PostMark: A Robust Blackbox Watermark for Large Language Models (2024.emnlp-main)
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| Challenge: | Existing methods to detect LLM-generated text require access to the underlying LLM’s logits, which LLM providers are loath to share due to fears of model distillation. |
| Approach: | They develop a post-hoc watermarking procedure that inserts an input-dependent set of words into the text after the decoding process has completed. |
| Outcome: | The proposed method is more robust to paraphrasing attacks than existing methods. |
GumbelSoft: Diversified Language Model Watermarking via the GumbelMax-trick (2024.acl-long)
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| Challenge: | Large language models generate human-like content, but they also pose a problem with generation diversity, negatively impacting generation diversity and user experience. |
| Approach: | They propose a Logits-Addition watermark and three variants that aim to enhance diversity to overcome generation diversity challenges. |
| Outcome: | The Logits-Addition watermark outperforms the Logits+Trick-based watermark in diversity tests and outperformed other decoding-based methods by 0.1 to 0.3. |