| Rounds | Impossible subspace trails |
---|---|---|
SIMECK32 | 11 | (0|0|0|0,0|0|0|00*0) \(\nrightarrow \) (0001 |*000 |**00 |***0, 0|0|0*00 |0**0) |
 |  | (0|0|0*00 |0**0,0001 |*000 |**00 |***0) \(\nrightarrow \) (0|0|0|00*0, 0|0|0|0) |
SIMECK48 | 13 | (0|0|0|0|0|0,0|0|0|0|000* |000*) \(\nrightarrow \) (0|1000|0*00 |0**0 |0*** |0***, |
 |  | 0|0|0|00*0 |00** |00**) |
 |  | (0|0|0|00*0 |00** |00**, 0|1000|0*00 |0**0 |0*** |0***) \(\nrightarrow \) |
 |  | (0|0|0|0|000* |000*, 0|0|0|0|0|0) |
SIMECK64 | 15 | (0|0|0|0|0|0|0|0,0|0|0|0|0|0|0|0*00) \(\nrightarrow \) (0|1000|0*00 |0**0 |0*** | |
 |  | 0***| ?|?, 0|0|0|00*0 |00** |00** |*0** |?) |
 |  | (0|0|0|00*0 |00** |00** |*0** |?, 0|1000|0*00 |0**0 |0*** |0***| ?|?) \(\nrightarrow \) |
 |  | (0|0|0|0|0|0|0|0*00, 0|0|0|0|0|0|0|0) |