Note that they have decomposed the GOST S-box into several non-linear 4-bit functions. While this is certainly great for hardware optimization, the cipher is st

Note that they have decomposed the GOST S-box into several non-linear 4-bit functions. While this is certainly great for hardware optimization, the cipher is still not fully understood: the authors have not determined why these particular functions were chosen. Non-linear functions are given in the paper as magic constants.