CONCEALED INFORMATION EXCHANGE METHOD Russian patent published in 2019 - IPC H04L9/00 

FIELD: electrical communication engineering.

SUBSTANCE: invention relates to telecommunications and can be used in communication systems for transmitting digital information with a high degree of confidentiality. Method comprises steps of specifying a masked binary message M of limited length, dividing the concealed binary message into K blocks of length n, forming a database of any binary digital files F_j, transmitting binary digital file F_j, wherein a transmitting side generates a full set of binary combinations {n} of length n, for each binary digital file F_j determining the number of repetitions of each binary combination of length n, constructing a variation series P_j binary combinations of length n according to their repetition frequency, binary digital files F_j are selected, in which n_i-th member of the variational series coincides with K-th unit with length n of concealed message M, receiving binary digital file F_j is received at receiving side, determining the number of repetitions of each binary combination of length n in the received file F_j, constructing a variational series P_j binary combinations of length n on frequency of their repetition, form a concealed binary message M by successive writing n_i-th members of a variational series of each received digital binary file F_j.

EFFECT: high stealthiness of information exchange.

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