A new steganography method via various animation timing effects in PowerPoint files

In this paper, a new steganography method that hides message via various animation timing effects in a PowerPoint file is proposed. The animation effects are designed for the presenter to emphasis the key points, control the flow or enrich the interesting in presentation. Then the animation timing effect is the speed, time and repeat control part of animation effect. It is worth mentioning that adding animation effects does not change any content of the slides in the PowerPoint file. In contrast to other steganography methods, using various animation effects to hide message not only livens up on-screen presentations, but also keeps the real content of the PowerPoint file intact.