In this paper, a novel digital data-hiding technique
for the high-quality audio file is introduced. The data is embedded
into the frequency domain of the host audio signal utilizing
the Fast Fourier Transform (FFT). The data is embedded into
the phase element of the selected samples using the rounding
concept of the traditional Phase Shift Keying (PSK) technique.
The perceptual quality of the embedded audio file is changed as
minimum as possible which means that there will be no noticeable
difference between the original and the embedded audio file by
the human ears.