In 1998 C. Cachin proposed an information-theoretic approach to steganography. In particular, in the framework of this approach, so-called perfectly secure stegosystems were defined, where messages that carry and do not carry hidden information are statistically indistinguishable. There was also described a universal steganographic system, for which this property holds only asymptotically, as the message length grows, while encoding and decoding complexity increases exponentially. (By definition, a system is universal if it is also applicable in the case where probabilistic characteristics of messages used to transmit hidden information are not known completely.)
Problems of Information Transmission – Springer Journals
Published: Jul 18, 2009
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