Label-only Model Inversion Attack: The Attack that Requires the Least Information

• URL: http://arxiv.org/abs/2203.06555v1
• Date: Sun, 13 Mar 2022 03:03:49 GMT
• Title: Label-only Model Inversion Attack: The Attack that Requires the Least Information
• Authors: Dayong Ye and Tianqing Zhu and Shuai Zhou and Bo Liu and Wanlei Zhou
• Abstract summary: In a model inversion attack, an adversary attempts to reconstruct the data records, used to train a target model, using only the model's output. We have found a model inversion method that can reconstruct the input data records based only on the output labels.
• Score: 14.061083728194378
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: In a model inversion attack, an adversary attempts to reconstruct the data records, used to train a target model, using only the model's output. In launching a contemporary model inversion attack, the strategies discussed are generally based on either predicted confidence score vectors, i.e., black-box attacks, or the parameters of a target model, i.e., white-box attacks. However, in the real world, model owners usually only give out the predicted labels; the confidence score vectors and model parameters are hidden as a defense mechanism to prevent such attacks. Unfortunately, we have found a model inversion method that can reconstruct the input data records based only on the output labels. We believe this is the attack that requires the least information to succeed and, therefore, has the best applicability. The key idea is to exploit the error rate of the target model to compute the median distance from a set of data records to the decision boundary of the target model. The distance, then, is used to generate confidence score vectors which are adopted to train an attack model to reconstruct the data records. The experimental results show that highly recognizable data records can be reconstructed with far less information than existing methods.

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