Cabinet Noir
>Cryptoanalysis / 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
Learn
History
Practice
Ciphertext to break
Variant
Beaufort
Variant Beaufort
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Alphabet
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Hints
Easy
Medium
Hard
Custom
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processing.beaufort.cracker.hints.toggles.highlightRepeats
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processing.beaufort.cracker.hints.toggles.showGaps
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Show confidence bars
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Show the English reference
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Show the match score
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Highlight the most likely candidate
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Live plaintext preview
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Crib panel
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1. Key length
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2. Key letters
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3. Done
Paste ciphertext first.
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Created by Denys Grybov in 2021
v.0.4.0 // released on 27.10.2026