METHOD TO GENERATE ALTERNATING KEY FOR UNIT CODING AND TRANSFER OF CODED DATA Russian patent published in 2012 - IPC H04L9/00 

FIELD: information technologies.

SUBSTANCE: identical closed keys are entered in a receiver and a transmitter, and then in the transmitter a sequence is generated from separate k-digit units of data, afterwards a sequence of subkeys is received from the closed key with the possibility of coding of data units in the transmitter and decoding of the transmitted data units in the receiver, and unit-by-unit transfer of data, at the same time the value of each subsequent (i+1) subkey is determined in compliance with the value of the previous i subkey of the same sequence according to the functional dependence, besides, prior to transfer of coded data, an additional sequence is generated in the transmitter from modifiers from n-digit random numbers, which do not exceed the digit number of data units (k>n), afterwards the value of the subsequent (i+1) modifier is introduced into the previous i data unit, which is a carrier of the alternating key modifier, with subsequent use when generating the subsequent value of the (i-1) closed subkey in the transmitter and the receiver.

EFFECT: higher cryptographic resistance of a data transfer system.

3 cl, 2 dwg