Cabinet Noir
>Cryptoanalysis / Nihilist cipher
Not sure which cipher? Identify it
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Polybius coordinates plus a repeating numeric key, added digit by digit without carry — Vigenère on numbers.
Type
polyalphabetic substitution cipher
Breaking it
medium to break by hand
Era
Russia, 1880s
Name
Russian Nihilist prisoners smuggling numbers past the censors; a forerunner of the VIC cipher
Modes
encrypt · decrypt · cryptoanalysis
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Tool
Cryptoanalysis
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History
Practice
Not the right cipher? Identify it
Ciphertext to break
Hints
Easy
Medium
Hard
Custom
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Grey out impossible key numbers
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Suggest letters by frequency
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1. Key length
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2. Key numbers
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3. Square
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4. Done
The stream has 0 numbers. A repeating key leaves periodic fingerprints — pick the period the cards rank highest.
Too few numbers for a period analysis — paste a longer cryptogram.
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Created by Denys Grybov in 2021
v.0.4.0 // released on 25.10.2026