Kuznyechik encryption is executed as follows. A 128-bit.Plain text block is fed to the input. This plain text is added.With the first round subkey modulo two. This is followed.By 9 rounds of transform. Each round consists on three.Operations: S transform L transform and addition with,,,The respective subkey. The output of the ninth round is a.128-bit cipher text. The decryption algorithm uses inverse.Operations with reverse order of round subkeys. The general.Data flow chart of Kuznyechik is shown in Fig. 1.
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