15 • Playfair

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Type: Substitution

> playfair cipher uses an array of 5x5 containing a keyword or phrase. The first step is to create a grid based on the key. The second step is to encrypt the letters of the message by selecting them in pairs.

Key: melons

(Note: grid size is 5x5 and i/j can interchange)



M|E|L|O|N
S|A|B|C|D
F|G|H|I |K
P|Q|R|T|U
V|W|X|Y|Z



Plaintext: VALENTINES
VA LE NT IN ES



Ciphertext: WSOLOUJOMA

WS OL OU JO MA

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