Cabinet Noir
>Encrypt / Nihilist cipher
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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
Message
i
Square key
i
Key word
i
Space-separated numbers
i
1
2
3
4
5
1
A
B
C
D
E
2
F
G
H
I
K
3
L
M
N
O
P
4
Q
R
S
T
U
5
V
W
X
Y
Z
The square the coordinates come from.
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Created by Denys Grybov in 2021
v.0.4.0 // released on 25.10.2026