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Large language models (LLMs) have achieved remarkable performance on a wide range of tasks. However, recent studies have shown that LLMs can memorize training data and simple repeated tokens can trick the model to leak the data. In this…

Cryptography and Security · Computer Science 2024-05-21 Yang Bai , Ge Pei , Jindong Gu , Yong Yang , Xingjun Ma

Large Language Models (LLMs) are trained on massive web-crawled corpora. This poses risks of leakage, including personal information, copyrighted texts, and benchmark datasets. Such leakage leads to undermining human trust in AI due to…

Computation and Language · Computer Science 2024-03-26 Masahiro Kaneko , Timothy Baldwin

The expanding integration of Large Language Models (LLMs) into recommender systems poses critical challenges to evaluation reliability. This paper identifies and investigates a previously overlooked issue: benchmark data leakage in…

Machine Learning · Computer Science 2026-05-27 Mingqiao Zhang , Qiyao Peng , Yinghui Wang , Hongtao Liu , Yumeng Wang

Large Language Models (LLMs) are widely utilized in software engineering (SE) tasks, such as code generation and automated program repair. However, their reliance on extensive and often undisclosed pre-training datasets raises significant…

Software Engineering · Computer Science 2025-02-11 Xin Zhou , Martin Weyssow , Ratnadira Widyasari , Ting Zhang , Junda He , Yunbo Lyu , Jianming Chang , Beiqi Zhang , Dan Huang , David Lo

Large language models (LLMs) have shown great capabilities in various tasks but also exhibited memorization of training data, raising tremendous privacy and copyright concerns. While prior works have studied memorization during…

Artificial Intelligence · Computer Science 2024-02-26 Shenglai Zeng , Yaxin Li , Jie Ren , Yiding Liu , Han Xu , Pengfei He , Yue Xing , Shuaiqiang Wang , Jiliang Tang , Dawei Yin

Large Language Models (LLMs) have become dominant in the Natural Language Processing (NLP) field causing a huge surge in progress in a short amount of time. However, their limitations are still a mystery and have primarily been explored…

Software Engineering · Computer Science 2024-04-11 Nathan Cooper , Torsten Scholak

Tokenization is the first - and often underappreciated - layer of computation in language models. While Chain-of-Thought (CoT) prompting enables transformer models to approximate recurrent computation by externalizing intermediate steps, we…

Computation and Language · Computer Science 2025-05-21 Xiang Zhang , Juntai Cao , Jiaqi Wei , Yiwei Xu , Chenyu You

Public datasets are often used to evaluate the efficacy and generalizability of state-of-the-art methods for many tasks in natural language processing (NLP). However, the presence of overlap between the train and test datasets can lead to…

Computation and Language · Computer Science 2021-02-04 Aparna Elangovan , Jiayuan He , Karin Verspoor

Leaked secrets, such as passwords and API keys, in codebases were responsible for numerous security breaches. Existing heuristic techniques, such as pattern matching, entropy analysis, and machine learning, exist to detect and alert…

Cryptography and Security · Computer Science 2020-08-14 Zhen Yu Ding , Benjamin Khakshoor , Justin Paglierani , Mantej Rajpal

Membership inference attacks (MIAs) are widely used to assess the privacy risks associated with machine learning models. However, when these attacks are applied to pre-trained large language models (LLMs), they encounter significant…

Cryptography and Security · Computer Science 2026-05-26 Meng Tong , Yuntao Du , Kejiang Chen , Weiming Zhang , Ninghui Li

The deployment of large language models (LLMs) on third-party devices requires new ways to protect model intellectual property. While Trusted Execution Environments (TEEs) offer a promising solution, their performance limits can lead to a…

Cryptography and Security · Computer Science 2026-02-12 Abhishek Saini , Haolin Jiang , Hang Liu

Secure multi-party machine learning allows several parties to build a model on their pooled data to increase utility while not explicitly sharing data with each other. We show that such multi-party computation can cause leakage of global…

Machine Learning · Computer Science 2021-06-21 Wanrong Zhang , Shruti Tople , Olga Ohrimenko

The prevalent use of Byte Pair Encoding (BPE) in Large Language Models (LLMs) facilitates robust handling of subword units and avoids issues of out-of-vocabulary words. Despite its success, a critical challenge persists: long tokens, rich…

Computation and Language · Computer Science 2024-11-11 Haoran Lian , Yizhe Xiong , Zijia Lin , Jianwei Niu , Shasha Mo , Hui Chen , Peng Liu , Guiguang Ding

Recently, it has been shown that Machine Learning models can leak sensitive information about their training data. This information leakage is exposed through membership and attribute inference attacks. Although many attack strategies have…

Machine Learning · Computer Science 2023-03-08 Ganesh Del Grosso , Georg Pichler , Catuscia Palamidessi , Pablo Piantanida

Recent advancements in large language models(LLMs), such as GPT-4 and GPT-4o, have shown exceptional performance, especially in languages with abundant resources like English, thanks to extensive datasets that ensure robust training.…

Computation and Language · Computer Science 2024-11-15 Jin Yang , Zhiqiang Wang , Yanbin Lin , Zunduo Zhao

Information leakage to a guessing adversary in index coding is studied, where some messages in the system are sensitive and others are not. The non-sensitive messages can be used by the server like secret keys to mitigate leakage of the…

Information Theory · Computer Science 2022-05-24 Yucheng Liu , Lawrence Ong , Phee Lep Yeoh , Parastoo Sadeghi , Joerg Kliewer , Sarah Johnson

Large language models (LLMs) for code rely on subword tokenizers, such as byte-pair encoding (BPE), learned from mixed natural language text and programming language code but driven by statistics rather than grammar. As a result,…

Computation and Language · Computer Science 2025-10-17 Yinxi Li , Yuntian Deng , Pengyu Nie

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

Unlearning in large language models (LLMs) is critical for regulatory compliance and for building ethical generative AI systems that avoid producing private, toxic, illegal, or copyrighted content. Despite rapid progress, in this work, we…

Machine Learning · Computer Science 2026-05-29 Hadi Reisizadeh , Jiajun Ruan , Yiwei Chen , Soumyadeep Pal , Sijia Liu , Mingyi Hong

Large language models (LMs) have been shown to memorize parts of their training data, and when prompted appropriately, they will emit the memorized training data verbatim. This is undesirable because memorization violates privacy (exposing…

Machine Learning · Computer Science 2023-03-07 Nicholas Carlini , Daphne Ippolito , Matthew Jagielski , Katherine Lee , Florian Tramer , Chiyuan Zhang