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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…

Large Language Models (LLMs) have a privacy concern because they memorize training data (including personally identifiable information (PII) like emails and phone numbers) and leak it during inference. A company can train an LLM on its…

Cryptography and Security · Computer Science 2023-07-21 Jaydeep Borkar

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

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

Vision-Language Models (VLMs) have made remarkable progress in document-based Visual Question Answering (i.e., responding to queries about the contents of an input document provided as an image). In this work, we show these models can…

Computer Vision and Pattern Recognition · Computer Science 2024-07-12 Francesco Pinto , Nathalie Rauschmayr , Florian Tramèr , Philip Torr , Federico Tombari

Large Language Models (LLMs) have been reported to "leak" Personally Identifiable Information (PII), with successful PII reconstruction often interpreted as evidence of memorization. We propose a principled revision of memorization…

Computation and Language · Computer Science 2026-01-08 Xiaoyu Luo , Yiyi Chen , Qiongxiu Li , Johannes Bjerva

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

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 transformed natural language processing, but their ability to memorize training data poses significant privacy risks. This paper investigates model inversion attacks on the Llama 3.2 model, a multilingual…

Machine Learning · Computer Science 2025-07-08 Sathesh P. Sivashanmugam

The advancement of large language models (LLMs) brings notable improvements across various applications, while simultaneously raising concerns about potential private data exposure. One notable capability of LLMs is their ability to form…

Computation and Language · Computer Science 2024-02-12 Hanyin Shao , Jie Huang , Shen Zheng , Kevin Chen-Chuan Chang

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

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

Large language models for code (LLM4Code) have greatly improved developer productivity but also raise privacy concerns due to their reliance on open-source repositories containing abundant personally identifiable information (PII). Prior…

Software Engineering · Computer Science 2025-12-10 Hua Yang , Alejandro Velasco , Sen Fang , Bowen Xu , Denys Poshyvanyk

Machine learning poses severe privacy concerns as it has been shown that the learned models can reveal sensitive information about their training data. Many works have investigated the effect of widely adopted data augmentation and…

Machine Learning · Computer Science 2024-03-26 Xiao Li , Qiongxiu Li , Zhanhao Hu , Xiaolin Hu

The proliferation of Large Language Models (LLMs) has driven considerable interest in fine-tuning them with domain-specific data to create specialized language models. Nevertheless, such domain-specific fine-tuning data often contains…

Computation and Language · Computer Science 2024-10-29 Yijia Xiao , Yiqiao Jin , Yushi Bai , Yue Wu , Xianjun Yang , Xiao Luo , Wenchao Yu , Xujiang Zhao , Yanchi Liu , Quanquan Gu , Haifeng Chen , Wei Wang , Wei Cheng

The ever-increasing adoption of Large Language Models in critical sectors like finance, healthcare, and government raises privacy concerns regarding the handling of sensitive Personally Identifiable Information (PII) during training. In…

Machine Learning · Computer Science 2026-01-06 Intae Jeon , Yujeong Kwon , Hyungjoon Koo

The rapid advancement and widespread use of large language models (LLMs) have raised significant concerns regarding the potential leakage of personally identifiable information (PII). These models are often trained on vast quantities of…

Cryptography and Security · Computer Science 2023-07-06 Siwon Kim , Sangdoo Yun , Hwaran Lee , Martin Gubri , Sungroh Yoon , Seong Joon Oh

Machine learning practitioners often fine-tune generative pre-trained models like GPT-3 to improve model performance at specific tasks. Previous works, however, suggest that fine-tuned machine learning models memorize and emit sensitive…

Machine Learning · Computer Science 2024-04-17 Albert Yu Sun , Eliott Zemour , Arushi Saxena , Udith Vaidyanathan , Eric Lin , Christian Lau , Vaikkunth Mugunthan

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

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
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