Disappearing Cryptography: Information Hiding: Steganography and Watermarking (2nd Edition)
Disappearing Cryptography: Information Hiding: Steganography and Watermarking (2nd Edition)
A square-root law for active wardens
Proceedings of the thirteenth ACM multimedia workshop on Multimedia and security
Covertness analysis of subliminal channels in legitimate communication
ADCONS'11 Proceedings of the 2011 international conference on Advanced Computing, Networking and Security
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Supraliminal channels are robust public channels based on multimedia content, allowing innocuous key exchange in the presence of an active warden. One approach to supraliminal communication embeds bits in the pseudo-random state used to produce computer-generated special effects in hybrid media such as a videoconferencing session. In this paper we describe an application for wireless phones whose audio effects betray pseudo-random state and hence potential key information for an innocuous exchange protocol. Implementation of a walkie-talkie application for the Apple iPhone shows that hundreds of bits can be reliably transmitted per effect.