For the English full text of the article please see the attached PDF-File (English version follows Russian version).ABSTRACT The article deals with the problems of using steganography methods for transmitting data. The authors justify their approach by arguing that the importance of cryptography in terms of transfer of hidden data i s obvious, however, being cryptographic, coded information maintains potential threat with the mere existence of an encrypted message, that is, an indication that it is necessary to apply cryptanalysis. With the help of steganography, mathematical methods are constructed that deprive the carrier of the potential threat of these prompts. The article proposes to transmit data encoded into a QR code, pre-masking it. In particular, for reliability of restoring the «original», it is proposed to solve the same problem by different methods through iteration using linear systems, the Radon transform, the boundary problem for the Poisson equation, and beyond this, methods based on probability theory. The advantages of this option include the possibility of using modern computer tools and software developed in the field of various types of tomography and in mathematical physics, while slightly modifying them. Keywords: cryptography, steganography, quick response code, information security, Radon transform, Poisson equation, iterative methods.