|Informative Information for the Uninformed
Much research has been done in the field of steganography utilizing an audio cover-medium. Techniques such as using audio to convey messages in both the human audible and inaudible spectrum as well as various methods for the digital embedding of information into the audio data itself have all been explored; so much in fact that many methods are now considered standard. Many of the most recent implementations cannot be considered to advance the state of research in the area as they generally only implement the standard methods.
It is important to note that the significant majority of previous research in the sub-discipline of audio steganography, however, has focused on static, unchanging audio data files. Tools such as S-Tools, MP3Stego, Hide 4 PGP, and many others, are just such implementations, employing standard embedding methods with WAV, MP3, and VOC audio file cover-mediums, respectively. Very few practical implementations have been developed that utilize audio steganography with a cover-medium that is in a flux state or within streaming or real-time media sessions.