FIELD: information technologies.
SUBSTANCE: in the proposed method a multialphabetical replacement table (MRT) is generated, during coding each symbol of an open text in accordance with a random law is replaced with a permissible real number from the MRT, produced as a result of replacement with the help of the MRT, the number is represented by the value of the determined integral, and values of upper and lower integration limits (IL) are sent to a communication line. A type of a subintegral function and a form of the MRT are considered secret, in process of cryptogram transfer the produced distribution of real numbers of the cryptogram is analysed and corrected so that it is approximated to even distribution. For this purpose prior to coding of another open text symbol, an output distribution histogram is analysed, and an area of global minimum is found on the histogram, one of IL is selected so that it is within the global minimum area, and the second IL is calculated with account of the found first IL and the number produced with the help of the MRT, so that it is within the area of global or local minimum of the histogram.
EFFECT: improved cryptographic immunity.
15 dwg, 3 tbl, 2 ex
