Cabinet Noir
>Cryptoanalysis / ADFGVX cipher
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The German WWI field cipher that split every letter into two of six letters and then shuffled the result — until Georges Painvin broke it.
Type
fractionation + transposition cipher
Breaking it
hard to break by hand
Era
1918 (World War I)
Name
Fritz Nebel, German army signal corps
Modes
encrypt · decrypt · cryptoanalysis
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Tool
Cryptoanalysis
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Ciphertext to break
Variant
ADFGX (1918)
ADFGVX (1918)
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Created by Denys Grybov in 2021
v.0.4.0 // released on 18.10.2026