CM Bifid Decoder
Cipher Text
Period
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Polybius square size
5x5
6x6
Plaintext Square
Ciphertext Square
Keyword
Pattern
Start/End corner
HORIZONTAL
VERTICAL
SPIRAL - CLOCKWISE
SPIRAL - COUNTERCLOCKWISE
CRAB SPIRAL - CLOCKWISE
CRAB SPIRAL - COUNTERCLOCKWISE
DIAGONAL - NORTHEAST
DIAGONAL - SOUTHEAST
DIAGONAL - SOUTHWEST
DIAGONAL - NORTHWEST
Boustrophedon
UPPER LEFT
UPPER RIGHT
LOWER LEFT
LOWER RIGHT
HORIZONTAL
VERTICAL
SPIRAL - CLOCKWISE
SPIRAL - COUNTERCLOCKWISE
CRAB SPIRAL - CLOCKWISE
CRAB SPIRAL - COUNTERCLOCKWISE
DIAGONAL - NORTHEAST
DIAGONAL - SOUTHEAST
DIAGONAL - SOUTHWEST
DIAGONAL - NORTHWEST
Boustrophedon
UPPER LEFT
UPPER RIGHT
LOWER LEFT
LOWER RIGHT
a
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f
g
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i
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o
p
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t
u
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x
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z
A
B
C
D
E
F
G
H
I
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z