Towards the Vulnerability of Watermarking Artificial Intelligence Generated Content

Artificial Intelligence Generated Content (AIGC) is gaining great popularity in social media, with many commercial services available. These services leverage advanced generative models, such as latent diffusion models and large language models, to generate creative content (e.g., realistic images, fluent sentences) for users. The usage of such generated content needs to be highly regulated, as the service providers need to ensure the users do not violate the usage policies (e.g., abuse for commercialization, generating and distributing unsafe content). Numerous watermarking approaches have been proposed recently. However, in this paper, we show that an adversary can easily break these watermarking mechanisms. Specifically, we consider two possible attacks. (1) Watermark removal: the adversary can easily erase the embedded watermark from the generated content and then use it freely without the regulation of the service provider. (2) Watermark forge: the adversary can create illegal content with forged watermarks from another user, causing the service provider to make wrong attributions. We propose WMaGi, a unified framework to achieve both attacks in a holistic way. The key idea is to leverage a pre-trained diffusion model for content processing, and a generative adversarial network for watermark removing or forging. We evaluate WMaGi on different datasets and embedding setups. The results prove that it can achieve high success rates while maintaining the quality of the generated content. Compared with existing diffusion model-based attacks, WMaGi is 5,050$\sim$11,000$\times$ faster.