Issues of increasing the efficiency of replacement blocks for cryptoalgorithms round functions

The article is devoted to the questions of increasing the efficiency of one of the main cryptographic primitives of block encryption — 5-block. The variants of constructing the replacement block based on the block of stochastic data transformation are considered, providing, among other things, improving the statistical properties of the transformed sequences. An approach that consists in replacing not a single byte, but a whole state is proposed. The influence of this approach on the scattering and mixing properties of modern multidimensional block cipher architectures is demonstrated. The possibility of using hybrid architectures for constructing replacement blocks is evaluated.