In this project, we will establish technologies for preventing and defending against the spread of fake information, targeting not only unimodal media consisting of a single modality such as image/video, audio, and text, but also multimodal media consisting of multiple modalities. Furthermore, we will build a fake information research infrastructure (SYNTHETIQ X), which consists of a large dataset of real and fake information and a large number of generation, defense, and prevention models, and is suitable for practicing the offensive and defensive strategies of generating fake information and its defense and prevention.