THE ROUTE CIPHER CONSISTS IN A TRANSPOSITION WHERE THE CLEAR TEXT IS WRITTEN IN A GRILLE OF
FIXED DIMENSION AND THEN IS READ OFF FOLLOWING A METHOD GIVEN BY A KEY.
EXAMPLE:
CLEAR TEXT: ATTACK THE ENEMY BEHIND THE SEASIDE
GRILLE: A K N E T A
T T E H H S
T H M I E I
A E Y N S D
C E B D E E
KEY: SPIRAL INWARDS,CLOCKWISE,STARTING FROM THE TOP RIGHT
CODED TEXT: ASIDEEDBECATTAKNETHESNYEHTEHIM
THIS CODE HAS MANY MORE KEYS THAN A RAIL FENCE CIPHER BUT IT ISN'T PROOF AGAINST A FREQUENCY
ANALYSIS