© 2004 Computer Academic Underground
Audio
§Messages can be hidden in common audio formatted files or the audio itself.  Some methods include:
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*Transmitting a message in the human-inaudible audio spectrum *Assigning musical notes values and then creating or adding to a musical score, either played or on sheet music
*Digitally embedding a message into an audio file
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•Messages can be hidden in audio files or in the audio itself.
•The human-inaudible audio spectrum can be used to transmit a message that a computer would be able to detect, or
•Musical tones and lengths of notes in the actual audio can be used to convey messages.
•Morse code is a simple example of an audible encoding that could potentially be included in a musical track, such as creating the entire musical score out of quarter and eighth notes, representing dashes and dots.
•And of course, you can digitally embed a message into the bits of the data file itself.