Abstract
Unlike subliminal or steganographic channels, a supraliminal channel encodes information in the semantic content of cover data, generating innocent communication in a manner similar to mimic functions. These low-bitrate channels are robust to active wardens, and can be used with subliminal channels to achieve steganographic public key exchange. Automated generation of innocent-looking content, however, remains a difficult problem.
Apple’s iChat, a popular instant-messaging client and the default client on the Macintosh operating system, includes a video chat facility that allows the user to apply special effects such as replacing the user’s background with a video file. We show how this can be used to implement a high-bitrate supraliminal channel, by embedding a computer animation engineered to communicate ciphertext by its pseudo-random behavior.
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© 2008 Springer-Verlag Berlin Heidelberg
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Craver, S., Li, E., Yu, J., Atakli, I. (2008). A Supraliminal Channel in a Videoconferencing Application. In: Solanki, K., Sullivan, K., Madhow, U. (eds) Information Hiding. IH 2008. Lecture Notes in Computer Science, vol 5284. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-88961-8_20
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DOI: https://doi.org/10.1007/978-3-540-88961-8_20
Publisher Name: Springer, Berlin, Heidelberg
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