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Browsing by Author Afanasyeva, Olesya:

  • Korostil, Jurii; Afanasyeva, Olesya (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2013)
    The problems of embedding of message codes into Acoustic environment of speech are researched. The peculiarities of speech perception by human hearing are analyzed. As an example of acoustic message environment and codes of hidden messages embedded into it is reviewed a channel of mobile communication in the part of transformations which are implemented with acoustic signals. Approach to build a model of process of transmission of speech via non-linear channel basing on imagination about speech signals spectrum is developed. The proposals on methods of use of such models for analysis and interpretation of distortions of signals made by transformations, implemented in example channel are presente
  • Afanasyeva, Olesya (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    This paper contains research on and methods of determining values for basic parameters of steganographic systems. In particular, a parameter of concealing the presence of information in a digital environment is researched. Using this particular parameter increases the degree of protection of a message introduced into a digital environment. This parameter is one of the fundamental ones in case of implementation of a steganalysis system. Besides that, this paper contains a review of parameters of redundancy of a digital environment and the parameter of steganogram resistance to technological transformations in digital environments.

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