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Unlearning methods have the potential to improve the privacy and safety of large language models (LLMs) by removing sensitive or harmful information post hoc. The LLM unlearning research community has increasingly turned toward empirical…

Computation and Language · Computer Science 2025-04-09 Pratiksha Thaker , Shengyuan Hu , Neil Kale , Yash Maurya , Zhiwei Steven Wu , Virginia Smith

Despite the strong capabilities of Large Language Models (LLMs) to acquire knowledge from their training corpora, the memorization of sensitive information in the corpora such as copyrighted, biased, and private content has led to ethical…

Computation and Language · Computer Science 2025-05-29 James Y. Huang , Wenxuan Zhou , Fei Wang , Fred Morstatter , Sheng Zhang , Hoifung Poon , Muhao Chen

Language models (LMs) risk inadvertently memorizing and divulging sensitive or personally identifiable information (PII) seen in training data, causing privacy concerns. Current approaches to address this issue involve costly dataset…

Computation and Language · Computer Science 2025-09-09 Tomer Ashuach , Martin Tutek , Yonatan Belinkov

Current techniques for privacy auditing of large language models (LLMs) have limited efficacy -- they rely on basic approaches to generate canaries which leads to weak membership inference attacks that in turn give loose lower bounds on the…

Cryptography and Security · Computer Science 2025-03-11 Ashwinee Panda , Xinyu Tang , Milad Nasr , Christopher A. Choquette-Choo , Prateek Mittal

The significant advancements in large language models (LLMs) give rise to a promising research direction, i.e., leveraging LLMs as recommenders (LLMRec). The efficacy of LLMRec arises from the open-world knowledge and reasoning capabilities…

Information Retrieval · Computer Science 2024-07-02 Hangyu Wang , Jianghao Lin , Bo Chen , Yang Yang , Ruiming Tang , Weinan Zhang , Yong Yu

Fine-tuning large language models (LLMs) for specific tasks introduces privacy risks, as models may inadvertently memorise and leak sensitive training data. While Differential Privacy (DP) offers a solution to mitigate these risks, it…

Machine Learning · Computer Science 2024-11-26 Olivia Ma , Jonathan Passerat-Palmbach , Dmitrii Usynin

Are Large Pre-Trained Language Models Leaking Your Personal Information? In this paper, we analyze whether Pre-Trained Language Models (PLMs) are prone to leaking personal information. Specifically, we query PLMs for email addresses with…

Computation and Language · Computer Science 2022-10-21 Jie Huang , Hanyin Shao , Kevin Chen-Chuan Chang

Quantum machine learning (QML) has the potential to achieve quantum advantage for specific tasks by combining quantum computation with classical machine learning (ML). In classical ML, a significant challenge is membership-privacy leakage,…

Quantum Physics · Physics 2026-04-24 Junjian Su , Runze He , Guanghui Li , Sujuan Qin , Zhimin He , Haozhen Situ , Fei Gao

In the rapid advancement of artificial intelligence, privacy protection has become crucial, giving rise to machine unlearning. Machine unlearning is a technique that removes specific data influences from trained models without the need for…

Machine Learning · Computer Science 2025-06-23 Wenhan Chang , Tianqing Zhu , Ping Xiong , Yufeng Wu , Faqian Guan , Wanlei Zhou

Substantial research works have shown that deep models, e.g., pre-trained models, on the large corpus can learn universal language representations, which are beneficial for downstream NLP tasks. However, these powerful models are also…

Cryptography and Security · Computer Science 2024-07-16 Yixin Liu , Hongsheng Hu , Xun Chen , Xuyun Zhang , Lichao Sun

Large language models trained on web-scale data can memorize private or sensitive knowledge, raising significant privacy risks. Although some unlearning methods mitigate these risks, they remain vulnerable to "relearning" during subsequent…

Machine Learning · Computer Science 2026-03-05 Nakyeong Yang , Dong-Kyum Kim , Jea Kwon , Minsung Kim , Kyomin Jung , Meeyoung Cha

Exact unlearning was first introduced as a privacy mechanism that allowed a user to retract their data from machine learning models on request. Shortly after, inexact schemes were proposed to mitigate the impractical costs associated with…

When large language models are trained on private data, it can be a significant privacy risk for them to memorize and regurgitate sensitive information. In this work, we propose a new practical data extraction attack that we call "neural…

Cryptography and Security · Computer Science 2024-03-05 Ashwinee Panda , Christopher A. Choquette-Choo , Zhengming Zhang , Yaoqing Yang , Prateek Mittal

Machine unlearning enables the removal of specific data from ML models to uphold the right to be forgotten. While approximate unlearning algorithms offer efficient alternatives to full retraining, this work reveals that they fail to…

Machine Learning · Computer Science 2025-07-29 Yaxin Xiao , Qingqing Ye , Li Hu , Huadi Zheng , Haibo Hu , Zi Liang , Haoyang Li , Yijie Jiao

This work delves into the complexities of machine unlearning in the face of distributional shifts, particularly focusing on the challenges posed by non-uniform feature and label removal. With the advent of regulations like the GDPR…

Machine Learning · Computer Science 2024-03-14 Ling Han , Nanqing Luo , Hao Huang , Jing Chen , Mary-Anne Hartley

The generative Artificial Intelligence (AI) tools based on Large Language Models (LLMs) use billions of parameters to extensively analyse large datasets and extract critical private information such as, context, specific details,…

Cryptography and Security · Computer Science 2023-10-20 Imdad Ullah , Najm Hassan , Sukhpal Singh Gill , Basem Suleiman , Tariq Ahamed Ahanger , Zawar Shah , Junaid Qadir , Salil S. Kanhere

When users submit queries to Large Language Models (LLMs), their prompts can often contain sensitive data, forcing a difficult choice: Send the query to a powerful proprietary LLM providers to achieving state-of-the-art performance and risk…

Cryptography and Security · Computer Science 2026-04-21 Zheng Hui , Yijiang River Dong , Sanhanat Sivapiromrat , Ehsan Shareghi , Nigel Collier

Large Language Model (LLM) unlearning has recently gained significant attention, driven by the need to remove unwanted information, such as private, sensitive, or copyrighted content, from LLMs. However, conventional unlearning approaches…

Computation and Language · Computer Science 2025-06-03 Yixin Wan , Anil Ramakrishna , Kai-Wei Chang , Volkan Cevher , Rahul Gupta

Large multimodal language models have proven transformative in numerous applications. However, these models have been shown to memorize and leak pre-training data, raising serious user privacy and information security concerns. While data…

Computation and Language · Computer Science 2023-10-04 Yang Chen , Ethan Mendes , Sauvik Das , Wei Xu , Alan Ritter

While large language models (LLMs) exhibit remarkable capabilities, they increasingly face demands to unlearn memorized privacy-sensitive, copyrighted, or harmful content. Existing unlearning methods primarily focus on \emph{single-shot}…

Computation and Language · Computer Science 2026-05-08 Xiaoyu Xu , Minxin Du , Kun Fang , Yaxin Xiao , Zhicong Huang , Cheng Hong , Qingqing Ye , Haibo Hu
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