Kozina, G.L., Savchenko, Y.V., Voskoboinyk, V.O., Prokopovich-Tkachenko, D.I. and Katsiuba, V.V. 2024. MATHEMATICAL APPROACH TO IMPROVING THE PERFORMANCE OF THE PROGRAMMED IMPLEMENTATION OF THE SM4 CRYPTOALGORITHM. Systems and Technologies. 68, 2 (Dec. 2024), 78-85. DOI:https://doi.org/10.32782/2521-6643-2024-2-68.9.