Cabinet Noir
>Cryptoanalysis / Columnar transposition
Not sure which cipher? Identify it
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learning.columnar.description
Type
transposition cipher
Breaking it
easy to break by hand
Era
First World War
Name
Field ciphers; made famous by ADFGVX and the SOE
Modes
encrypt · decrypt · cryptoanalysis
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Tool
Cryptoanalysis
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Practice
Not the right cipher? Identify it
Ciphertext to break
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1. Column count
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2. Order the columns
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3. Done
The ciphertext was cut into columns and stacked. Its length must divide evenly by the column count — pick a candidate; the match score says how English-like the best column arrangement looks.
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Created by Denys Grybov in 2021
v.0.4.0 // released on 20.10.2026