Capacity of steganographic channels

  • Authors:
  • Jeremiah J. Harmsen;William A. Pearlman

  • Affiliations:
  • Rensselaer Polytechnic Institute, Troy, NY;Rensselaer Polytechnic Institute, Troy, NY

  • Venue:
  • MM&Sec '05 Proceedings of the 7th workshop on Multimedia and security
  • Year:
  • 2005

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Abstract

An information-theoretic approach is used to determine the amount of information that may be safely transferred over a steganographic channel with a passive adversary. A steganographic channel, or stego-channel is a pair consisting of the channel transition probabilities and a detection function. When a message is sent, it first encounters a distortion (due to the channel), then is subject to inspection by a passive adversary (using the detection function). This paper presents results on the amount of information that may be transferred over an arbitrary stego-channel with vanishing probabilities of error and detection.