Cabinet Noir
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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
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History
Practice
Practice
Playfair cipher
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Sailboat at dawn
Easy
HD KM FH OQ OQ OD GU
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The game is afoot
Medium
AN AM AD EM EN SG TS IL KS
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The worst of times
Hard
CO CG XV KF ZC EV OV HI YU LV
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Created by Denys Grybov in 2021
v.0.4.0 // released on 18.10.2026