THE RAIL FENCE CIPHER USES A PARTICULAR TRANSPOSITION TO ENCODE MESSAGES.
THE TEXT IS WRITTEN DOWNWARDS AND DIAGONALLY ON LINES, GOING UP WHEN THE LAST ROW IS
REACHED AND DESCENDING WHEN THE FIRST LINE IS ACHIEVED.
ONCE IT IS FINISHED, THE TEXT IS WRITTEN DOWN FOLLOWING THE ROWS.
EXAMPLE:
CLEAR TEXT: ATTACK THE ENEMY BEHIND THE SEASIDE.
TRANSPOSITION:
A . . . C . . . E. . . . M . . . H . . . T . . . E . . . D .
. T . A . K . H . E . E. . Y . E . I . D . H . S . A . I . E
. . T . . . T . . . N . . . B . . . N. . . E . . . S . . .
CODED TEXT: ACEMH TEDTA KHEEY EIDHS AIETT NBNES
THIS CODE IS EASILY SOLVED WITH BRUCE FORCE ATTACK AND IT ISN’T VERY STRONG BECAUSE IT HAS A SMALL
NUMBER OF POSSIBLE USABLE KEYS.