Cabinet Noir
>Cryptoanalysis / Playfair cipher
Not sure which cipher? Identify it
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A digraph cipher: letter pairs move over a 5×5 square built from a keyword — the same letter encrypts differently depending on its partner.
Type
substitution cipher
Breaking it
hard to break by hand
Era
19th century
Name
Invented by Charles Wheatstone in 1854 and championed by Lord Playfair.
Modes
encrypt · decrypt · cryptoanalysis
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Tool
Cryptoanalysis
Learn
History
Practice
Not the right cipher? Identify it
Ciphertext to break
1. Digraphs
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2. Improve the square
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3. Done
Start the attack
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Start from keyword
Start from random square
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Created by Denys Grybov in 2021
v.0.4.0 // released on 18.10.2026