FIELD: physics, computer engineering.
SUBSTANCE: invention is related to the field of cryptography. Data subject to coding are divided into units, and combined coding of groups from several digital data units is carried out. Prior to coding, cryptographic key is used to form round subkeys in compliance with established schedule of keys. At that in process of the first data unit coding round subkeys used are subkeys formed from cryptographic key in compliance with key schedule, and in coding of all further data units round subkeys used are results of coding of previous data unit in group at the same iteration.
EFFECT: increased resistance of cryptographic analysis.
3 cl, 11 dwg
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