A new steganography method via combination in PowerPoint files

Steganography is the science of communicating secret information which no one apart from the intended recipient can be aware of. Most researchers focus on the medium of image, video and audio, while text is paid less attention, especially PowerPoint documents due to some shortcomings. In this paper, a new steganography method which hides information via different combinations of different objects in a PowerPoint file is proposed. Combination is widely used in PowerPoint files to help people operate different objects simultaneously. During our hiding process, the original content of the PowerPoint file is not changed at all, thus making the result stegodocument more natural and safe from traditional attacks compared to other steganography method.