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Membership Inference Attacks (MIAs) infer whether a data point is in the training data of a machine learning model. It is a threat while being in the training data is private information of a data point. MIA correctly infers some data…

Cryptography and Security · Computer Science 2022-10-31 Mauro Conti , Jiaxin Li , Stjepan Picek

Membership inference attacks (MIAs) pose a critical privacy threat to fine-tuned large language models (LLMs), especially when models are adapted to domain-specific tasks using sensitive data. While prior black-box MIA techniques rely on…

Cryptography and Security · Computer Science 2025-12-23 Zhexi Lu , Hongliang Chi , Nathalie Baracaldo , Swanand Ravindra Kadhe , Yuseok Jeon , Lei Yu

In this paper we develop state-of-the-art privacy attacks against Large Language Models (LLMs), where an adversary with some access to the model tries to learn something about the underlying training data. Our headline results are new…

Cryptography and Security · Computer Science 2024-07-16 Jeffrey G. Wang , Jason Wang , Marvin Li , Seth Neel

With the emergence of powerful large-scale foundation models, the training paradigm is increasingly shifting from from-scratch training to transfer learning. This enables high utility training with small, domain-specific datasets typical in…

Machine Learning · Computer Science 2025-10-09 Yuxuan Bai , Gauri Pradhan , Marlon Tobaben , Antti Honkela

Large Language Models (LLMs) are increasingly used in a variety of applications, but concerns around membership inference have grown in parallel. Previous efforts focus on black-to-grey-box models, thus neglecting the potential benefit from…

Cryptography and Security · Computer Science 2025-01-13 Luis Ibanez-Lissen , Lorena Gonzalez-Manzano , Jose Maria de Fuentes , Nicolas Anciaux , Joaquin Garcia-Alfaro

Membership inference attacks (MIAs) pose a significant threat to the privacy of machine learning models and are widely used as tools for privacy assessment, auditing, and machine unlearning. While prior MIA research has primarily focused on…

Machine Learning · Computer Science 2025-07-04 Zhiqi Wang , Chengyu Zhang , Yuetian Chen , Nathalie Baracaldo , Swanand Kadhe , Lei Yu

Fine-tuned language models pose significant privacy risks, as they may memorize and expose sensitive information from their training data. Membership inference attacks (MIAs) provide a principled framework for auditing these risks, yet…

Computation and Language · Computer Science 2026-04-14 David Ilić , David Stanojević , Kostadin Cvejoski

Recent studies have shown that deep learning models are vulnerable to membership inference attacks (MIAs), which aim to infer whether a data record was used to train a target model or not. To analyze and study these vulnerabilities, various…

Machine Learning · Statistics 2025-08-12 Chenxu Zhao , Wei Qian , Aobo Chen , Mengdi Huai

Large language models (LLMs) are trained on massive web-scale corpora, raising growing concerns about privacy and copyright. Membership inference attacks (MIAs) aim to determine whether a given example was used during training. Existing LLM…

Machine Learning · Computer Science 2026-04-02 Ravi Ranjan , Utkarsh Grover , Xiaomin Lin , Agoritsa Polyzou

Large vision-language models (LVLMs) derive their capabilities from extensive training on vast corpora of visual and textual data. Empowered by large-scale parameters, these models often exhibit strong memorization of their training data,…

Cryptography and Security · Computer Science 2025-11-05 Jinhua Yin , Peiru Yang , Chen Yang , Huili Wang , Zhiyang Hu , Shangguang Wang , Yongfeng Huang , Tao Qi

Determining whether a dataset was part of a machine learning model's training data pool can reveal privacy vulnerabilities, a challenge often addressed through membership inference attacks (MIAs). Traditional MIAs typically require access…

Machine Learning · Computer Science 2025-06-03 Yongchao Huang

Membership inference attacks (MIAs) test whether a target data record belongs to a system's private data, and have become a standard tool to measure privacy leakage in machine learning systems. Prior work has primarily focused on training…

Cryptography and Security · Computer Science 2026-05-28 Kai Chen , Yan Pang , Tianhao Wang

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

Deep learning models have an intrinsic privacy issue as they memorize parts of their training data, creating a privacy leakage. Membership Inference Attacks (MIA) exploit it to obtain confidential information about the data used for…

Cryptography and Security · Computer Science 2025-03-13 Daniel Jiménez-López , Nuria Rodríguez-Barroso , M. Victoria Luzón , Francisco Herrera

Machine learning models can leak private information about their training data. The standard methods to measure this privacy risk, based on membership inference attacks (MIAs), only check if a given data point \textit{exactly} matches a…

Machine Learning · Computer Science 2025-09-11 Jiashu Tao , Reza Shokri

Membership inference attacks (MIAs) aim to determine whether a specific example was used to train a given language model. While prior work has explored prompt-based attacks such as ReCALL, these methods rely heavily on the assumption that…

Computation and Language · Computer Science 2026-01-27 Gyuwan Kim , Yang Li , Evangelia Spiliopoulou , Jie Ma , William Yang Wang

Transfer learning, successful in knowledge translation across related tasks, faces a substantial privacy threat from membership inference attacks (MIAs). These attacks, despite posing significant risk to ML model's training data, remain…

Cryptography and Security · Computer Science 2025-01-22 Cong Wu , Jing Chen , Qianru Fang , Kun He , Ziming Zhao , Hao Ren , Guowen Xu , Yang Liu , Yang Xiang

Membership inference attacks (MIAs) pose a serious threat to the privacy of machine learning models by allowing adversaries to determine whether a specific data sample was included in the training set. Although federated learning (FL) is…

Cryptography and Security · Computer Science 2026-01-27 Mohammad Zare , Pirooz Shamsinejadbabaki

Large vision-language models (VLLMs) exhibit promising capabilities for processing multi-modal tasks across various application scenarios. However, their emergence also raises significant data security concerns, given the potential…

Computer Vision and Pattern Recognition · Computer Science 2024-11-06 Zhan Li , Yongtao Wu , Yihang Chen , Francesco Tonin , Elias Abad Rocamora , Volkan Cevher

The rise of generative image models leads to privacy concerns when it comes to the huge datasets used to train such models. This paper investigates the possibility of inferring if a set of face images was used for fine-tuning a Latent…

Computer Vision and Pattern Recognition · Computer Science 2025-03-05 Lauritz Christian Holme , Anton Mosquera Storgaard , Siavash Arjomand Bigdeli