Cabinet Noir
>Decrypt / Beaufort cipher
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The Vigenère's mirror twin — same repeating key, subtraction the other way round, self-reciprocal.
Type
polyalphabetic substitution cipher
Breaking it
hard to break by hand
Era
Renaissance family, 19th-century name
Name
Royal Navy, named for Sir Francis Beaufort
Modes
encrypt · decrypt · cryptoanalysis
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Tool
Cryptoanalysis
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History
Practice
Message
i
Key
i
Variant
Beaufort
Variant Beaufort
i
Alphabet
i
C = K − P: each row reads the alphabet backwards from its key letter.
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
Classic Beaufort is reciprocal — encrypting twice with the same key restores the plaintext.
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Created by Denys Grybov in 2021
v.0.4.0 // released on 27.10.2026