OK, continuing the research I want to tell some facts:
Before permutating (rearranging) columns with key, free squares are filed with letter X:
K E Y K E Y1 F A G 1 F A G 2 V D F 3 F A A 4 F X X
VDFVXDVADXVAAVGAGXAVAVGGGGXAFGGAXGAGVVXFGAVDXGDX
Jet
- 775
- 1
- 5
- 11