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Fine-tuning Large Language Models (LLMs) on sensitive datasets carries a substantial risk of unintended memorization and leakage of Personally Identifiable Information (PII), which can violate privacy regulations and compromise individual…

Concerns regarding Large Language Models (LLMs) to memorize and disclose private information, particularly Personally Identifiable Information (PII), become prominent within the community. Many efforts have been made to mitigate the privacy…

Machine Learning · Computer Science 2024-05-21 Ruizhe Chen , Tianxiang Hu , Yang Feng , Zuozhu Liu

Large Language Models (LLMs) trained on massive data capture rich information embedded in the training data. However, this also introduces the risk of privacy leakage, particularly involving personally identifiable information (PII).…

Computation and Language · Computer Science 2025-06-10 Wenshuo Dong , Qingsong Yang , Shu Yang , Lijie Hu , Meng Ding , Wanyu Lin , Tianhang Zheng , Di Wang

Large language models (LLMs) have significantly transformed natural language understanding and generation, but they raise privacy concerns due to potential exposure of sensitive information. Studies have highlighted the risk of information…

Machine Learning · Computer Science 2025-11-20 Bishnu Bhusal , Manoj Acharya , Ramneet Kaur , Colin Samplawski , Anirban Roy , Adam D. Cobb , Rohit Chadha , Susmit Jha

Large Language Models (LLMs) are widely used in sensitive domains, including healthcare, finance, and legal services, raising concerns about potential private information leaks during inference. Privacy extraction attacks, such as…

Cryptography and Security · Computer Science 2025-06-25 Jinwen He , Yiyang Lu , Zijin Lin , Kai Chen , Yue Zhao

Language Models (LMs) have been shown to leak information about training data through sentence-level membership inference and reconstruction attacks. Understanding the risk of LMs leaking Personally Identifiable Information (PII) has…

Machine Learning · Computer Science 2023-04-25 Nils Lukas , Ahmed Salem , Robert Sim , Shruti Tople , Lukas Wutschitz , Santiago Zanella-Béguelin

Large Language Models (LLMs) have demonstrated remarkable capabilities across diverse natural language processing tasks, but their tendency to memorize training data poses significant privacy risks, particularly during fine-tuning…

Computation and Language · Computer Science 2025-08-21 Badrinath Ramakrishnan , Akshaya Balaji

Large Language Models (LLMs) memorize, and thus, among huge amounts of uncontrolled data, may memorize Personally Identifiable Information (PII), which should not be stored and, consequently, not leaked. In this paper, we introduce Private…

Cryptography and Security · Computer Science 2025-08-22 Elena Sofia Ruzzetti , Giancarlo A. Xompero , Davide Venditti , Fabio Massimo Zanzotto

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

With the rise of large language models (LLMs), increasing research has recognized their risk of leaking personally identifiable information (PII) under malicious attacks. Although efforts have been made to protect PII in LLMs, existing…

Computation and Language · Computer Science 2025-03-12 Martin Kuo , Jingyang Zhang , Jianyi Zhang , Minxue Tang , Louis DiValentin , Aolin Ding , Jingwei Sun , William Chen , Amin Hass , Tianlong Chen , Yiran Chen , Hai Li

Recent large-scale natural language processing (NLP) systems use a pre-trained Large Language Model (LLM) on massive and diverse corpora as a headstart. In practice, the pre-trained model is adapted to a wide array of tasks via fine-tuning…

Computation and Language · Computer Science 2022-09-12 Jimit Majmudar , Christophe Dupuy , Charith Peris , Sami Smaili , Rahul Gupta , Richard Zemel

Large Language Models (LLMs) represent a significant advancement in artificial intelligence, finding applications across various domains. However, their reliance on massive internet-sourced datasets for training brings notable privacy…

Cryptography and Security · Computer Science 2025-02-11 Michele Miranda , Elena Sofia Ruzzetti , Andrea Santilli , Fabio Massimo Zanzotto , Sébastien Bratières , Emanuele Rodolà

The widespread usage of online Large Language Models (LLMs) inference services has raised significant privacy concerns about the potential exposure of private information in user inputs to malicious eavesdroppers. Existing privacy…

Cryptography and Security · Computer Science 2025-05-29 Ziqian Zeng , Jianwei Wang , Junyao Yang , Zhengdong Lu , Haoran Li , Huiping Zhuang , Cen Chen

With the increasing use of conversational AI systems, there is growing concern over privacy leaks, especially when users share sensitive personal data in interactions with Large Language Models (LLMs). Conversations shared with these models…

Computation and Language · Computer Science 2025-11-03 Jayden Serenari , Stephen Lee

The rapid advancement of large language models (LLMs) has revolutionized natural language processing, enabling applications in diverse domains such as healthcare, finance and education. However, the growing reliance on extensive data for…

Cryptography and Security · Computer Science 2024-12-10 Guoshenghui Zhao , Eric Song

Large Language Models (LLMs) pose significant privacy risks, potentially leaking training data due to implicit memorization. Existing privacy attacks primarily focus on membership inference attacks (MIAs) or data extraction attacks, but…

Computation and Language · Computer Science 2025-06-11 Wenlong Meng , Zhenyuan Guo , Lenan Wu , Chen Gong , Wenyan Liu , Weixian Li , Chengkun Wei , Wenzhi Chen

As language models (LMs) are widely utilized in personalized communication scenarios (e.g., sending emails, writing social media posts) and endowed with a certain level of agency, ensuring they act in accordance with the contextual privacy…

Computation and Language · Computer Science 2025-03-17 Yijia Shao , Tianshi Li , Weiyan Shi , Yanchen Liu , Diyi Yang

The rapid development of language models (LMs) brings unprecedented accessibility and usage for both models and users. On the one hand, powerful LMs achieve state-of-the-art performance over numerous downstream NLP tasks. On the other hand,…

Computation and Language · Computer Science 2024-06-04 Haoran Li , Dadi Guo , Donghao Li , Wei Fan , Qi Hu , Xin Liu , Chunkit Chan , Duanyi Yao , Yuan Yao , Yangqiu Song

Redacting Personally Identifiable Information (PII) from unstructured text is critical for ensuring data privacy in regulated domains. While earlier approaches have relied on rule-based systems and domain-specific Named Entity Recognition…

Cryptography and Security · Computer Science 2025-08-08 Leon Garza , Anantaa Kotal , Aritran Piplai , Lavanya Elluri , Prajit Das , Aman Chadha

Multimodal large language models (MLLMs) have demonstrated remarkable capabilities in processing and reasoning over diverse modalities, but their advanced abilities also raise significant privacy concerns, particularly regarding Personally…

Cryptography and Security · Computer Science 2025-10-01 Boyang Zhang , Istemi Ekin Akkus , Ruichuan Chen , Alice Dethise , Klaus Satzke , Ivica Rimac , Yang Zhang
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