METHOD OF CRYPTOGRAPHIC DATA CONVERSION Russian patent published in 2020 - IPC H04L9/00 

FIELD: physics.

SUBSTANCE: invention relates to cryptography. Method involves cryptographic conversion of input data to outputs after r consecutively performed rounds using corresponding round cryptographic keys in each round, determining preliminary permutation for k elements of converted data, where k is number of elements of converted data and k = 1, 2, 3, …, and its corresponding factorial set, which is an ordered set including n! elements, where n = k number of factorial set, selecting cryptographic key from range of values from 1 to n! determined factorial set, value of cryptographic key is presented in factorial number system based on base of predetermined factorial set, performing r rounds on h cyclic shifts of all k initial shift elements, wherein r = n-1, and value h corresponds to value of key element of corresponding round, after each round, the last element is excluded from the obtained permutation and the position of the element of the final rearrangement of the converted data is put into the corresponding round.

EFFECT: technical result consists in improvement of cryptographic stability of data obtained as a result of conversion.

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