CALoR: Towards Comprehensive Model Inversion Defense

• URL: http://arxiv.org/abs/2410.05814v1
• Date: Tue, 8 Oct 2024 08:44:01 GMT
• Title: CALoR: Towards Comprehensive Model Inversion Defense
• Authors: Hongyao Yu, Yixiang Qiu, Hao Fang, Bin Chen, Sijin Yu, Bin Wang, Shu-Tao Xia, Ke Xu,
• Abstract summary: Model Inversion Attacks (MIAs) aim at recovering privacy-sensitive training data from the knowledge encoded in released machine learning models. Recent advances in the MIA field have significantly enhanced the attack performance under multiple scenarios. We propose a robust defense mechanism, integrating Confidence Adaptation and Low-Rank compression.
• Score: 43.2642796582236
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Model Inversion Attacks (MIAs) aim at recovering privacy-sensitive training data from the knowledge encoded in the released machine learning models. Recent advances in the MIA field have significantly enhanced the attack performance under multiple scenarios, posing serious privacy risks of Deep Neural Networks (DNNs). However, the development of defense strategies against MIAs is relatively backward to resist the latest MIAs and existing defenses fail to achieve further trade-off between model utility and model robustness. In this paper, we provide an in-depth analysis from the perspective of intrinsic vulnerabilities of MIAs, comprehensively uncovering the weaknesses inherent in the basic pipeline, which are partially investigated in the previous defenses. Building upon these new insights, we propose a robust defense mechanism, integrating Confidence Adaptation and Low-Rank compression(CALoR). Our method includes a novel robustness-enhanced classification loss specially-designed for model inversion defenses and reveals the extraordinary effectiveness of compressing the classification header. With CALoR, we can mislead the optimization objective, reduce the leaked information and impede the backpropagation of MIAs, thus mitigating the risk of privacy leakage. Extensive experimental results demonstrate that our method achieves state-of-the-art (SOTA) defense performance against MIAs and exhibits superior generalization to existing defenses across various scenarios.

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