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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

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) demonstrate remarkable capabilities in question answering (QA), but metrics for assessing their reliance on memorization versus retrieval remain underdeveloped. Moreover, while finetuned models are…

Machine Learning · Computer Science 2025-06-17 Peter Carragher , Abhinand Jha , R Raghav , Kathleen M. Carley

Large Language Models (LLMs) have demonstrated remarkable performance across diverse natural language processing tasks, yet their ability to memorize structured knowledge remains underexplored. In this paper, we investigate the extent to…

Computation and Language · Computer Science 2025-04-02 Marco Bombieri , Paolo Fiorini , Simone Paolo Ponzetto , Marco Rospocher

Sequence models, such as Large Language Models (LLMs) and autoregressive image generators, have a tendency to memorize and inadvertently leak sensitive information. While this tendency has critical legal implications, existing tools are…

Cryptography and Security · Computer Science 2025-06-06 Lorenzo Rossi , Michael Aerni , Jie Zhang , Florian Tramèr

Quantization enables efficient deployment of large language models (LLMs) in resource-constrained environments by significantly reducing memory and computation costs. While quantized LLMs often maintain performance on perplexity and…

Artificial Intelligence · Computer Science 2025-08-28 Yao Fu , Xianxuan Long , Runchao Li , Haotian Yu , Mu Sheng , Xiaotian Han , Yu Yin , Pan Li

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

The pretrained large language models (LLMs) are finetuned with labeled data for better instruction following ability and alignment with human values. In this paper, we study the learning dynamics of LLM finetuning on reasoning tasks and…

Computation and Language · Computer Science 2025-09-30 Zhiwen Ruan , Yun Chen , Yutao Hou , Peng Li , Yang Liu , Guanhua Chen

Large Language Models (LLMs) have demonstrated advanced capabilities in both text generation and comprehension, and their application to data archives might facilitate the privatization of sensitive information about the data subjects. In…

Cryptography and Security · Computer Science 2025-04-08 Stefano Cirillo , Domenico Desiato , Giuseppe Polese , Monica Maria Lucia Sebillo , Giandomenico Solimando

We explore a knowledge sanitization approach to mitigate the privacy concerns associated with large language models (LLMs). LLMs trained on a large corpus of Web data can memorize and potentially reveal sensitive or confidential…

Computation and Language · Computer Science 2024-03-05 Yoichi Ishibashi , Hidetoshi Shimodaira

Large language models (LLMs) have demonstrated remarkable proficiency in understanding and generating responses to complex queries through large-scale pre-training. However, the efficacy of these models in memorizing and reasoning among…

Computation and Language · Computer Science 2024-02-23 Qiyuan He , Yizhong Wang , Wenya Wang

Entity resolution, the task of identifying and merging records that refer to the same real-world entity, is crucial in sectors like e-commerce, healthcare, and law enforcement. Large Language Models (LLMs) introduce an innovative approach…

Computation and Language · Computer Science 2024-09-13 Huahang Li , Longyu Feng , Shuangyin Li , Fei Hao , Chen Jason Zhang , Yuanfeng Song

Rapid advances in Natural Language Processing (NLP) have revolutionized many fields, including healthcare. However, these advances raise significant privacy concerns, especially when pre-trained models fine-tuned and specialized on…

Computation and Language · Computer Science 2026-05-21 Antoine Boutet , Lucas Magnana , Juliette Sénéchal

Large Language Models (LLMs) are known to memorize significant portions of their training data. Parts of this memorized content have been shown to be extractable by simply querying the model, which poses a privacy risk. We present a novel…

Computation and Language · Computer Science 2023-05-22 Mustafa Safa Ozdayi , Charith Peris , Jack FitzGerald , Christophe Dupuy , Jimit Majmudar , Haidar Khan , Rahil Parikh , Rahul Gupta

Large Language Models (LLMs) have demonstrated strong performance as knowledge repositories, enabling models to understand user queries and generate accurate and context-aware responses. Extensive evaluation setups have corroborated the…

Computation and Language · Computer Science 2024-11-19 Prasoon Bajpai , Sarah Masud , Tanmoy Chakraborty

Large Language Models (LLMs) trained on web-scale text corpora have been shown to capture world knowledge in their parameters. However, the mechanism by which language models store different types of knowledge is poorly understood. In this…

Computation and Language · Computer Science 2024-11-08 Jared Fernandez , Yonatan Bisk , Emma Strubell

This paper explores the risk that a large language model (LLM) trained for code generation on data mined from software repositories will generate content that discloses sensitive information included in its training data. We decompose this…

Cryptography and Security · Computer Science 2026-04-16 Rafiqul Rabin , Sean McGregor , Nick Judd

The growing use of large language models in sensitive domains has exposed a critical weakness: the inability to ensure that private information can be permanently forgotten. Yet these systems still lack reliable mechanisms to guarantee that…

Machine Learning · Computer Science 2025-11-14 James Jin Kang , Dang Bui , Thanh Pham , Huo-Chong Ling

The rapid deployment of large language models (LLMs) in consumer applications has led to frequent exchanges of personal information. To obtain useful responses, users often share more than necessary, increasing privacy risks via…

Machine Learning · Computer Science 2025-10-07 Jijie Zhou , Niloofar Mireshghallah , Tianshi Li

The wide adoption and application of Masked language models~(MLMs) on sensitive data (from legal to medical) necessitates a thorough quantitative investigation into their privacy vulnerabilities -- to what extent do MLMs leak information…

Machine Learning · Computer Science 2022-11-07 Fatemehsadat Mireshghallah , Kartik Goyal , Archit Uniyal , Taylor Berg-Kirkpatrick , Reza Shokri