Wide Flat Minimum Watermarking for Robust Ownership Verification of GANs

• URL: http://arxiv.org/abs/2310.16919v1
• Date: Wed, 25 Oct 2023 18:38:10 GMT
• Title: Wide Flat Minimum Watermarking for Robust Ownership Verification of GANs
• Authors: Jianwei Fei, Zhihua Xia, Benedetta Tondi, Mauro Barni
• Abstract summary: We propose a novel multi-bit box-free watermarking method for GANs with improved robustness against white-box attacks. The watermark is embedded by adding an extra watermarking loss term during GAN training. We show that the presence of the watermark has a negligible impact on the quality of the generated images.
• Score: 23.639074918667625
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We propose a novel multi-bit box-free watermarking method for the protection of Intellectual Property Rights (IPR) of GANs with improved robustness against white-box attacks like fine-tuning, pruning, quantization, and surrogate model attacks. The watermark is embedded by adding an extra watermarking loss term during GAN training, ensuring that the images generated by the GAN contain an invisible watermark that can be retrieved by a pre-trained watermark decoder. In order to improve the robustness against white-box model-level attacks, we make sure that the model converges to a wide flat minimum of the watermarking loss term, in such a way that any modification of the model parameters does not erase the watermark. To do so, we add random noise vectors to the parameters of the generator and require that the watermarking loss term is as invariant as possible with respect to the presence of noise. This procedure forces the generator to converge to a wide flat minimum of the watermarking loss. The proposed method is architectureand dataset-agnostic, thus being applicable to many different generation tasks and models, as well as to CNN-based image processing architectures. We present the results of extensive experiments showing that the presence of the watermark has a negligible impact on the quality of the generated images, and proving the superior robustness of the watermark against model modification and surrogate model attacks.

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