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We show that remotely hosted applications employing in-context learning when augmented with a retrieval function to select in-context examples can be vulnerable to membership-inference attacks even when the service provider and users are…

Cryptography and Security · Computer Science 2026-05-07 Tejas Kulkarni , Antti Koskela , Laith Zumot

Membership inference attacks (MIAs) attempt to predict whether a particular datapoint is a member of a target model's training data. Despite extensive research on traditional machine learning models, there has been limited work studying MIA…

Machine learning models are known to leak sensitive information, as they inevitably memorize (parts of) their training data. More alarmingly, large language models (LLMs) are now trained on nearly all available data, which amplifies the…

Machine Learning · Computer Science 2025-10-10 Jiashu Tao , Reza Shokri

Membership inference attacks (MIAs) have been extensively studied in large language models (LLMs) and vision-language models (VLMs), yet their implications for vision-language-action (VLA) models remain largely unexplored. VLA models differ…

Cryptography and Security · Computer Science 2026-05-11 Yuefeng Peng , Mingzhe Li , Kejing Xia , Renhao Zhang , Amir Houmansadr

Membership Inference Attacks (MIAs) act as a crucial auditing tool for the opaque training data of Large Language Models (LLMs). However, existing techniques predominantly rely on inaccessible model internals (e.g., logits) or suffer from…

Computation and Language · Computer Science 2026-01-19 Jiatong Yi , Yanyang Li

Federated learning (FL) is a popular approach to facilitate privacy-aware machine learning since it allows multiple clients to collaboratively train a global model without granting others access to their private data. It is, however, known…

Cryptography and Security · Computer Science 2023-10-03 Hongsheng Hu , Xuyun Zhang , Zoran Salcic , Lichao Sun , Kim-Kwang Raymond Choo , Gillian Dobbie

Membership inference attacks aim to infer whether a data record has been used to train a target model by observing its predictions. In sensitive domains such as healthcare, this can constitute a severe privacy violation. In this work we…

Cryptography and Security · Computer Science 2022-12-05 Tomas Chobola , Dmitrii Usynin , Georgios Kaissis

Membership inference attacks (MIA) attempt to verify the membership of a given data sample in the training set for a model. MIA has become relevant in recent years, following the rapid development of large language models (LLM). Many are…

Computation and Language · Computer Science 2025-02-04 Haritz Puerto , Martin Gubri , Sangdoo Yun , Seong Joon Oh

Membership Inference Attack (MIA) aims to determine whether a specific data sample was included in the training dataset of a target model. Traditional MIA approaches rely on shadow models to mimic target model behavior, but their…

Information Retrieval · Computer Science 2026-03-20 Li Cuihong , Huang Xiaowen , Yin Chuanhuan , Sang Jitao

The lack of data transparency in Large Language Models (LLMs) has highlighted the importance of Membership Inference Attack (MIA), which differentiates trained (member) and untrained (non-member) data. Though it shows success in previous…

Computation and Language · Computer Science 2024-12-19 Bowen Chen , Namgi Han , Yusuke Miyao

Membership inference attacks seek to infer membership of individual training instances of a model to which an adversary has black-box access through a machine learning-as-a-service API. In providing an in-depth characterization of…

Cryptography and Security · Computer Science 2019-02-04 Stacey Truex , Ling Liu , Mehmet Emre Gursoy , Lei Yu , Wenqi Wei

Source Inference Attack (SIA) in Federated Learning (FL) aims to identify which client used a target data point for local model training. It allows the central server to audit clients' data usage. In cross-silo FL, a client (silo) collects…

Cryptography and Security · Computer Science 2024-10-01 Jiaxin Li , Marco Arazzi , Antonino Nocera , Mauro Conti

Adapting Large Language Models (LLMs) to specific tasks introduces concerns about computational efficiency, prompting an exploration of efficient methods such as In-Context Learning (ICL). However, the vulnerability of ICL to privacy…

Cryptography and Security · Computer Science 2024-09-04 Rui Wen , Zheng Li , Michael Backes , Yang Zhang

Machine learning models are prone to memorizing sensitive data, making them vulnerable to membership inference attacks in which an adversary aims to infer whether an input sample was used to train the model. Over the past few years,…

Cryptography and Security · Computer Science 2022-08-23 Xinlei He , Zheng Li , Weilin Xu , Cory Cornelius , Yang Zhang

Deep learning models for time series imputation are now essential in fields such as healthcare, the Internet of Things (IoT), and finance. However, their deployment raises critical privacy concerns. Beyond the well-known issue of unintended…

Machine Learning · Computer Science 2026-03-26 Faiz Taleb , Ivan Gazeau , Maryline Laurent

Machine learning models are vulnerable to membership inference attack, which can be used to determine whether a given sample appears in the training data. Most existing methods assume the attacker has full access to the features of the…

Machine Learning · Computer Science 2025-12-24 Xurun Wang , Guangrui Liu , Xinjie Li , Haoyu He , Lin Yao , Zhongyun Hua , Weizhe Zhang

Membership inference attacks (MIA) aim to infer whether a particular data point is part of the training dataset of a model. In this paper, we propose a new task in the context of LLM privacy: entity-level discovery of membership risk…

Machine Learning · Computer Science 2025-11-04 Ali Satvaty , Suzan Verberne , Fatih Turkmen

A Membership Inference Attack (MIA) assesses how much a target machine learning model reveals about its training data by determining whether specific query instances were part of the training set. State-of-the-art MIAs rely on training…

Cryptography and Security · Computer Science 2026-01-13 Yuntao Du , Yuetian Chen , Hanshen Xiao , Bruno Ribeiro , Ninghui Li

Membership inference (MI) determines if a sample was part of a victim model training set. Recent development of MI attacks focus on record-level membership inference which limits their application in many real-world scenarios. For example,…

Machine Learning · Computer Science 2022-04-27 Guoyao Li , Shahbaz Rezaei , Xin Liu

Membership inference attacks (MIAs), which enable adversaries to determine whether specific data points were part of a model's training dataset, have emerged as an important framework to understand, assess, and quantify the potential…

Cryptography and Security · Computer Science 2026-03-23 Toan Tran , Olivera Kotevska , Li Xiong