Abstract
This article proposes a method for secure data transmission in the audible domain of the frequency spectrum of the air environment. Specifically, it proposes the method of construction, embedding, extraction and recovery of a hidden signal transmitted through the air audio channel. The hidden signal consists of two parts. One part is used for synchronization, and the other one is used for carrying information. The basis of the synchronization part is the Kasami sequence, whereas the basis of the information part is a code word of the binary BCH code. Both parts of the hidden signal are obtained through special encoding of their binary elements. The encoding uses Gold sequences and RZ codes. Speech or music are used as a carrier signal. The hidden signal is embedded in the frequency domain of the carrying signal. The embedding is based on amplitude modulation of individual spectral components of the carrying signal. The article discusses the possibility of restoring the hidden signal after the transmission of the stego-audio signal through the air audio channel. The article presents the results of simulation modeling and field experiments of transmission of the stego-audio signal through the air audio channel.
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