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Playfair


The Playfair code is very easy to use. First, choose a key and then fill in a 5 x 5 square with your key. The letters 'i' and 'j' counts as one and double letters were removed.

T

H

I

S

A

M

P

L

E

C

R

B

D

F

G

K

N

O

Q

U

V

W

X

Y

Z

 

I

S

A

L

E

C

D

F

G


The bigrams were encoded by taking the two opposite corners of the rectangle it formed in the square, e.g. DA becomes IG.

If both letters of the bigram are in the same line, then the next letters below are used; if both are in the same column, the next.