METHOD FOR BLOCK ENCRYPTION OF MESSAGES AND TRANSMISSION OF ENCRYPTED DATA WITH CLOSED KEY Russian patent published in 2013 - IPC H04L9/00 

FIELD: radio engineering, communication.

SUBSTANCE: before transmitting a message (for i=0), the same closed key value is initiated in the transmitter and the receiver. When transmitting each data unit, the closed key value is synchronously varied in the transmitter and the receiver. The transmitter 1 sends the receiver 2 data units over an open communication channel 3. The transmitter 1 performs encryption and the receiver 2 performs decryption of the data units. In the transmitter 1, the message is divided into separate data subunits 10 whose number N≥2. According to the invention, each i-th data subunit 10 is joined to the i-th service information subunit 11, where the (i+1)-th key modifier is recorded. Each unit is encrypted by its own closed subkey. The subkey for the (i+1)-th unit functionally depends on the subkey of the previous i-th unit 12 and the (i+1)-th key modifier, which is generated at the output of a random number generator 13.

EFFECT: high cryptographic robustness.

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