METHOD FOR STEGANOGRAPHICAL CLOAKING OF INFORMATION Russian patent published in 2009 - IPC H04L9/00 

FIELD: information technologies.

SUBSTANCE: plain text is converted to cryptogram, for this purpose it is coded by methods of polyalphabetic replacement (on key K1) and by shifting method (on key K2), produced cryptogram is cloaked in graphic container, at the same time image of each symbol in produced cryptogram is formed with the help of graphical matrix (GM) of n x m size in digital form from w information dots, along GM perimetre a dash-dot frame is formed, which consists of r border dots, and q masking dots are applied along the whole image field, numbers u = w + r + q for all GM are accepted as same, size of GM, order of arrangement of information dots, border dots in frame and masking dots is determined with the help of key K3, then dots are mixed in each GM in compliance with key K4, afterwards t = s + d + f of graphical or other containers are taken, information from mixed GM is distributed among s containers bit by bit in compliance with key K5, false information is placed into d containers, and f containers are left empty.

EFFECT: improved crypto-resistance and stegano-resistance.

13 cl, 31 dwg, 3 tbl