  In recent years, DeepFake technology has achieved unprecedented success in
high-quality video synthesis, whereas these methods also pose potential and
severe security threats to humanity. DeepFake can be bifurcated into
entertainment applications like face swapping and illicit uses such as
lip-syncing fraud. However, lip-forgery videos, which neither change identity
nor have discernible visual artifacts, present a formidable challenge to
existing DeepFake detection methods. Our preliminary experiments have shown
that the effectiveness of the existing methods often drastically decreases or
even fails when tackling lip-syncing videos.
  In this paper, for the first time, we propose a novel approach dedicated to
lip-forgery identification that exploits the inconsistency between lip
movements and audio signals. We also mimic human natural cognition by capturing
subtle biological links between lips and head regions to boost accuracy. To
better illustrate the effectiveness and advances of our proposed method, we
curate a high-quality LipSync dataset by employing the SOTA lip generator. We
hope this high-quality and diverse dataset could be well served the further
research on this challenging and interesting field. Experimental results show
that our approach gives an average accuracy of more than 95.3% in spotting
lip-syncing videos, significantly outperforming the baselines. Extensive
experiments demonstrate the capability to tackle deepfakes and the robustness
in surviving diverse input transformations. Our method achieves an accuracy of
up to 90.2% in real-world scenarios (e.g., WeChat video call) and shows its
powerful capabilities in real scenario deployment. To facilitate the progress
of this research community, we release all resources at
https://github.com/AaronComo/LipFD.
