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How much information about training samples can be leaked through synthetic data generated by Large Language Models (LLMs)? Overlooking the subtleties of information flow in synthetic data generation pipelines can lead to a false sense of…

Computation and Language · Computer Science 2026-02-13 Matthieu Meeus , Lukas Wutschitz , Santiago Zanella-Béguelin , Shruti Tople , Reza Shokri

Membership Inference Attacks (MIAs) determine whether a specific data point was included in the training set of a target model. In this paper, we introduce the Semantic Membership Inference Attack (SMIA), a novel approach that enhances MIA…

Machine Learning · Computer Science 2024-06-17 Hamid Mozaffari , Virendra J. Marathe

Membership inference attacks (MIAs) on diffusion models have emerged as potential evidence of unauthorized data usage in training pre-trained diffusion models. These attacks aim to detect the presence of specific images in training datasets…

Machine Learning · Computer Science 2024-10-07 Chumeng Liang , Jiaxuan You

Balancing strong privacy guarantees with high predictive performance is critical for time series forecasting (TSF) tasks involving Electronic Health Records (EHR). In this study, we explore how data augmentation can mitigate Membership…

Machine Learning · Computer Science 2025-11-10 Marius Fracarolli , Michael Staniek , Stefan Riezler

Membership Inference Attacks (MIAs) aim to predict whether a data sample belongs to the model's training set or not. Although prior research has extensively explored MIAs in Large Language Models (LLMs), they typically require accessing to…

Cryptography and Security · Computer Science 2025-02-27 Yu He , Boheng Li , Liu Liu , Zhongjie Ba , Wei Dong , Yiming Li , Zhan Qin , Kui Ren , Chun Chen

Artificial intelligence and machine learning have been integrated into all aspects of our lives and the privacy of personal data has attracted more and more attention. Since the generation of the model needs to extract the effective…

Cryptography and Security · Computer Science 2022-02-14 Ruikang Yang , Jianfeng Ma , Yinbin Miao , Xindi Ma

Deep learning models, while achieving remarkable performances, are vulnerable to membership inference attacks (MIAs). Although various defenses have been proposed, there is still substantial room for improvement in the privacy-utility…

Cryptography and Security · Computer Science 2025-09-29 Yuefeng Peng , Ali Naseh , Amir Houmansadr

With the widespread adoption of Large Language Models (LLMs) and increasingly stringent privacy regulations, protecting data privacy in LLMs has become essential, especially for privacy-sensitive applications. Membership Inference Attacks…

Cryptography and Security · Computer Science 2026-01-30 Md Tasnim Jawad , Mingyan Xiao , Yanzhao Wu

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

With the emergence of new evaluation metrics and attack methodologies for Membership Inference Attacks (MIA), it becomes essential to reevaluate previously accepted assumptions. In this paper, we revisit the longstanding debate regarding…

Machine Learning · Computer Science 2026-04-23 Fateme Rahmani , Mahdi Jafari Siavoshani , Mohammad Hossein Rohban

Synthetic data is seen as the most promising solution to share individual-level data while preserving privacy. Shadow modeling-based Membership Inference Attacks (MIAs) have become the standard approach to evaluate the privacy risk of…

Cryptography and Security · Computer Science 2024-02-12 Matthieu Meeus , Florent Guépin , Ana-Maria Cretu , Yves-Alexandre de Montjoye

The pervasive deployment of deep learning models across critical domains has concurrently intensified privacy concerns due to their inherent propensity for data memorization. While Membership Inference Attacks (MIAs) serve as the gold…

Machine Learning · Computer Science 2026-04-16 Chihan Huang , Huaijin Wang , Shuai Wang

Membership Inference Attacks (MIAs) pose a significant privacy risk by enabling adversaries to determine if a specific data point was part of a model's training set. This work empirically investigates whether MU algorithms can function as a…

Membership inference attacks (MIAs) are popular methods for empirically assessing the leakage of sensitive information in the training data through models or statistics learned from the data. The MIA vulnerability is often evaluated through…

Machine Learning · Computer Science 2026-05-26 Joonas Jälkö , Gauri Pradhan , Ossi Räisä , Antti Honkela

Model inversion attacks (MIAs) aim to create synthetic images that reflect the class-wise characteristics from a target classifier's private training data by exploiting the model's learned knowledge. Previous research has developed…

Machine Learning · Computer Science 2022-06-10 Lukas Struppek , Dominik Hintersdorf , Antonio De Almeida Correia , Antonia Adler , Kristian Kersting

We demonstrate how a target model's generalization gap leads directly to an effective deterministic black box membership inference attack (MIA). This provides an upper bound on how secure a model can be to MIA based on a simple metric.…

Machine Learning · Computer Science 2020-09-15 Jason W. Bentley , Daniel Gibney , Gary Hoppenworth , Sumit Kumar Jha

Optimization algorithms that seek flatter minima, such as Sharpness-Aware Minimization (SAM), are credited with improved generalization and robustness to noise. We ask whether such gains impact membership privacy. Surprisingly, we find that…

Machine Learning · Computer Science 2026-01-29 Young In Kim , Andrea Agiollo , Pratiksha Agrawal , Johannes O. Royset , Rajiv Khanna

Machine learning models can inadvertently expose confidential properties of their training data, making them vulnerable to membership inference attacks (MIA). While numerous evaluation methods exist, many require computationally expensive…

Machine Learning · Computer Science 2026-02-04 Richard J. Preen , Jim Smith

In membership inference attacks (MIAs), an adversary observes the predictions of a model to determine whether a sample is part of the model's training data. Existing MIA defenses conceal the presence of a target sample through strong…

Cryptography and Security · Computer Science 2022-03-03 Ismat Jarin , Birhanu Eshete

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