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In the age of agentic AI, the growing deployment of multi-modal models (MMs) has introduced new attack vectors that can leak sensitive training data in MMs, causing privacy leakage. This paper investigates a black-box privacy attack, i.e.,…

Computer Vision and Pattern Recognition · Computer Science 2025-11-27 David Amebley , Sayanton Dibbo

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

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

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

A Membership Inference Attack (MIA) assesses how much a trained machine learning model reveals about its training data by determining whether specific query instances were included in the dataset. We classify existing MIAs into adaptive or…

Cryptography and Security · Computer Science 2025-09-09 Yuntao Du , Jiacheng Li , Yuetian Chen , Kaiyuan Zhang , Zhizhen Yuan , Hanshen Xiao , Bruno Ribeiro , Ninghui Li

Recent work in the privacy literature shows that sample-targeted membership inference attacks (MIAs) significantly outperform untargeted approaches by a wide margin. Motivated by this observation, we address the following question: can the…

Machine Learning · Statistics 2026-05-27 Valentin Dorseuil , Jamal Atif , Olivier Cappé

Given the rising popularity of AI-generated art and the associated copyright concerns, identifying whether an artwork was used to train a diffusion model is an important research topic. The work approaches this problem from the membership…

Cryptography and Security · Computer Science 2025-08-14 Jingwei Li , Jing Dong , Tianxing He , Jingzhao Zhang

In the text processing context, most ML models are built on word embeddings. These embeddings are themselves trained on some datasets, potentially containing sensitive data. In some cases this training is done independently, in other cases,…

Computation and Language · Computer Science 2021-06-23 Saeed Mahloujifar , Huseyin A. Inan , Melissa Chase , Esha Ghosh , Marcello Hasegawa

The increasing prominence of deep learning applications and reliance on personalized data underscore the urgent need to address privacy vulnerabilities, particularly Membership Inference Attacks (MIAs). Despite numerous MIA studies,…

Machine Learning · Computer Science 2024-07-02 Chenxi Li , Abhinav Kumar , Zhen Guo , Jie Hou , Reza Tourani

Membership inference attacks (MIAs) aim to determine whether a sample was part of a model's training set, posing serious privacy risks for modern machine-learning systems. Existing MIAs primarily rely on static indicators, such as loss or…

Artificial Intelligence · Computer Science 2026-02-06 Amit Kravchik Taub , Fred M. Grabovski , Guy Amit , Yisroel Mirsky

Large Multimodal Language Models (MLLMs) are emerging as one of the foundational tools in an expanding range of applications. Consequently, understanding training-data leakage in these systems is increasingly critical. Log-probability-based…

Cryptography and Security · Computer Science 2026-05-22 Ziyi Tong , Feifei Sun , Le Minh Nguyen

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

Vision-Language Models (VLMs), built on pre-trained vision encoders and large language models (LLMs), have shown exceptional multi-modal understanding and dialog capabilities, positioning them as catalysts for the next technological…

Cryptography and Security · Computer Science 2025-02-10 Yuke Hu , Zheng Li , Zhihao Liu , Yang Zhang , Zhan Qin , Kui Ren , Chun Chen

While being deployed in many critical applications as core components, machine learning (ML) models are vulnerable to various security and privacy attacks. One major privacy attack in this domain is membership inference, where an adversary…

Cryptography and Security · Computer Science 2020-09-11 Yang Zou , Zhikun Zhang , Michael Backes , Yang Zhang

Membership inference attacks (MIAs) against Diffusion Models (DMs) raise pressing privacy concerns by revealing whether a sample was part of the training set. While existing methods typically rely on measuring reconstruction error across…

Machine Learning · Computer Science 2026-04-27 Mingxing Rao , Bowen Qu , Daniel Moyer

A fundamental issue in deep learning has been adversarial robustness. As these systems have scaled, such issues have persisted. Currently, large language models (LLMs) with billions of parameters suffer from adversarial attacks just like…

Machine Learning · Computer Science 2025-02-11 Brian Formento , Chuan Sheng Foo , See-Kiong Ng

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

Membership inference attacks (MIAs) against machine learning (ML) models aim to determine whether a given data point was part of the model training data. These attacks may pose significant privacy risks to individuals whose sensitive data…

Cryptography and Security · Computer Science 2025-11-24 Mona Khalil , Alberto Blanco-Justicia , Najeeb Jebreel , Josep Domingo-Ferrer

As large-scale models such as Large Language Models (LLMs) and Large Multimodal Models (LMMs) see increasing deployment, their privacy risks remain underexplored. Membership Inference Attacks (MIAs), which reveal whether a data point was…

Machine Learning · Computer Science 2025-09-03 Hengyu Wu , Yang Cao

The increasing reliance on diffusion models for generating synthetic images has amplified concerns about the unauthorized use of personal data, particularly facial images, in model training. In this paper, we introduce a novel identity…

Computer Vision and Pattern Recognition · Computer Science 2024-10-15 Jayneel Vora , Aditya Krishnan , Nader Bouacida , Prabhu RV Shankar , Prasant Mohapatra