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Xiaojian Yuan

4 accepted papers

2025

A Closer Look at Machine Unlearning for Large Language Models

ICLR 2025poster

Large language models (LLMs) may memorize sensitive or copyrighted content, raising privacy and legal concerns. Due to the high cost of retraining from scratch, researchers attempt to employ machine unlearning to remove specific content from LLMs while preserving the overall performance. In this pap…

2025

On the Vulnerability of Text Sanitization

NAACL 2025long

Text sanitization, which employs differential privacy to replace sensitive tokens with new ones, represents a significant technique for privacy protection. Typically, its performance in preserving privacy is evaluated by measuring the attack success rate (ASR) of reconstruction attacks, where attack…

2024

Data-Free Hard-Label Robustness Stealing Attack

AAAI 2024technical

The popularity of Machine Learning as a Service (MLaaS) has led to increased concerns about Model Stealing Attacks (MSA), which aim to craft a clone model by querying MLaaS. Currently, most research on MSA assumes that MLaaS can provide soft labels and that the attacker has a proxy dataset with a si…

2023

Pseudo Label-Guided Model Inversion Attack via Conditional Generative Adversarial Network

AAAI 2023technical

Model inversion (MI) attacks have raised increasing concerns about privacy, which can reconstruct training data from public models. Indeed, MI attacks can be formalized as an optimization problem that seeks private data in a certain space. Recent MI attacks leverage a generative adversarial network…