|Informative Information for the Uninformed
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This paper defines ``real-time'' use of steganography as the utilization of steganographic techniques to embed message data within an active, or real-time, media stream. The research and reference implementation presented herein focuses on VoIP call audio as the active media stream being targeted as cover-medium.
Nearly all uses of steganography targeting audio cover-medium in general, or VoIP cover-medium specifically, that were evaluated prior to performing this research were found to operate on a target cover-medium as a storage channel and provided separate ``hide'' and ``retrieve'' modes. In addition, most cover-medium that were targeted by such implementations were of a static nature such as WAV or MP3 files or were unidirectional such as streaming stego-audio to a recipient.
A few weeks prior to the research contained herein being initially presented at the DEFCON 15 hacker conference on August 3rd through 5th 2007, another use of steganography in a real-time fashion was made public via a research effort entitled Vo2IP. An analysis of this research effort and its deficiencies has been included in an updated version of the previously mentioned analysis paper.