Development of estimation method for the dependence of GOST 28147-89 cipher security on selected key information

In the paper, the dependence of the nonlinearity and of the dynamic distance for Boolean functions describing the round of the GOST 28147-89 algorithm on the round key and on the substitution table is investigated. The gained results can be used for selecting key and substitution table with the highest resistance of the cipher against the most widespread cryptoanalysis methods.