Audio steganograpgy by phase modification

In this paper, we propose a robust steganographic system that embeds high-capacity data in phase spectrum. Our approach is based on the assumption that partial alteration of selected frequency bins in the phase spectrum leads to a smooth transition while preserving phase continuity. The frequency bins, in the phase, selected for data hiding are first defined in the magnitude through an election process and then mapped into the phase spectrum to embed data. Perceptual and statistical study results demonstrate that, in comparison with a recently proposed magnitude based audio steganography method, the phase based approach gains a considerable advantage against steganalysis attacks while giving similar or comparable hiding capacity and audio quality.