Cabinet Noir
>Decrypt / Alberti cipher
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The first polyalphabetic cipher: two rotating discs switch alphabets every few letters.
Type
polyalphabetic substitution cipher
Breaking it
easy to break by hand
Era
15th century
Name
Devised by Leon Battista Alberti around 1467 on his cipher disk, Formula.
Modes
encrypt · decrypt · cryptoanalysis
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Tool
Cryptoanalysis
Learn
History
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Message
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Shift size
3
i
Period length
2
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Created by Denys Grybov in 2021
v.0.4.0 // released on 18.10.2026