Cabinet Noir>Practice / Autokey cipher

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Vigenère's actual cipher: the key starts with a short primer, then the plaintext itself feeds the keystream.
Typepolyalphabetic substitution cipher
Breaking ithard to break by hand
EraRenaissance — the real 1586 Vigenère
NameGiovan Battista Bellaso, 1553
Modesencrypt · decrypt · cryptoanalysis

Practice

Autokey cipher
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Autokey, warm-up

Easy
JEQEAMDETXZXPJLBAJLQFASAMDEOHYWPCWLBAJLQFASAMDESZLSFCMGIKUAWKMAMDESZLSFLSCQNGVYMKZ
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Poe, feeding on itself

Easy
TBTXICQRUBWQNUOKGLXLTUPAHZJAPXZRLTFRGAVENWRDGENUUSVVPFVVVRNUVAQLRNWUAVWQNEKSZPOSMGNILFTEXWQ
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Austen, the real Vigenère

Medium
JXTDALFCMPMNBMYKZUYTTETCNZHJEFQRRPSEWGWLGNLXMSVVTASESRAFXCFGJSYWCQTTRZIBHRIJMVRMZQSGUSNNSISX
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Hamlet, no period to find

Hard
OWHIBVESMHPFSKUOMBGULXXUXALBVRMBILAMFGEZRHIPVKQFGVFXMELGHZYRNRUMVWMQNRXTUHSCZBCSBIOLKFWYSTIM
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Created by Denys Grybov in 2021

v.0.4.0 // released on 27.10.2026