METHOD FOR NONLINEAR THREE-DIMENSIONAL MANY-ROUND CONVERSION OF DATA DOZEN Russian patent published in 2014 - IPC G06F7/58 

FIELD: information technology.

SUBSTANCE: method involves presenting input 1 and output 2 data blocks, all intermediate results S of conversions and round keys (RoundKeys) 3₀, 3₁ 3₂, 3₃ in form of a cubic array of bytes 4×4×4, defining a Layer 4 concept - quadratic array of bytes 4×4, presenting the first round key in form of four sub-keys (RoundSubKeys) 3_i0, 3_i1, 3_i2, 3_i3, i=1, 2, 3, each of which is in essence a quadratic array of bytes 4×4, adding 10 (XOR) the data block 1 with round key 3₀, three-dimensional conversion of the data block on layers 4_x0, 4_x1, 4_X2, 4_x3, 4_y0, 4_y1, 4_y2, 4_y3, 4_z0, 4_z1, 4_z2, 4_z3 respectively along x, y and z axes, including, in the procedure for two-dimensional conversion of layer 5 (T-Layer), four steps: replacing 6 bytes (SubBytes), mixing 7 rows (MixRows), mixing 8 columns (MixColumns), adding (XOR) 9 to a round sub-key (AddRoundSubKey).

EFFECT: high cryptographic robustness and faster nonlinear conversion.

4 dwg, 1 tbl