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>Decrypt / Autokey cipher
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Vigenère's actual cipher: the key starts with a short primer, then the plaintext itself feeds the keystream.
Type
polyalphabetic substitution cipher
Breaking it
hard to break by hand
Era
Renaissance — the real 1586 Vigenère
Name
Giovan Battista Bellaso, 1553
Modes
encrypt · decrypt · cryptoanalysis
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Tool
Cryptoanalysis
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History
Practice
Message
i
Primer
i
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Created by Denys Grybov in 2021
v.0.4.0 // released on 27.10.2026