Encrypt INSTRUMENTS with MONARCHY
text = INSTRUMENTSkey = MONARCHYmode = encrypt
Result: GATLMZBRTLSE
Playfair Cipher Demo
EDUCATIONAL DEMONSTRATION ONLY — The Playfair cipher encrypts pairs of letters (digraphs) using a 5×5 grid of the alphabet (I/J share a cell). Invented by Charles Wheatstone in 1854, it was named after Lord Playfair. It was the first practical digraph substitution cipher.
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Enter your values and press Calculate — the result appears here.
Worked examples
Frequently asked questions
Why encrypt letter pairs instead of individual letters?
Encrypting digraphs eliminates single-letter frequency patterns, making frequency analysis harder than with monoalphabetic ciphers.
How are double letters handled?
If a pair has the same letter (e.g., LL), an X is inserted between them. If the text has an odd number of letters, X is appended.
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