Cabinet Noir
>Cryptoanalysis / Vigènere cipher
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Each letter of the message is shifted by the matching letter of a repeating key.
Type
polyalphabetic substitution cipher
Breaking it
hard to break by hand
Era
16th century
Name
Described by Giovan Battista Bellaso in 1553, later misattributed to Blaise de Vigenère.
Modes
encrypt · decrypt · cryptoanalysis
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Tool
Cryptoanalysis
Learn
History
Practice
Not the right cipher? Identify it
Ciphertext to break
Alphabet
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Hints
Easy
Medium
Hard
Custom
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Highlight repeated sequences
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Show gaps between repeats
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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 18.10.2026