The implementation of Kuznyechik used in experiments was checked with the testing data sets defined in the standard. For our experiments we used HP Pavilion dv6 notebook equipped with Intel R _ CoreTM i5 CPU M 480 2.67 MHz and Linux Mint 17.2 Rafaela OS. The implementation of the original “Kuznechik” in C demonstrated the average encryption speed of 1MB/s.