Cabinet Noir>Practice / Beaufort cipher

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The Vigenère's mirror twin — same repeating key, subtraction the other way round, self-reciprocal.
Typepolyalphabetic substitution cipher
Breaking ithard to break by hand
EraRenaissance family, 19th-century name
NameRoyal Navy, named for Sir Francis Beaufort
Modesencrypt · decrypt · cryptoanalysis

Practice

Beaufort cipher
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Beaufort, warm-up

Easy
KLESMHLAZOMHEZHKSWAWHWEIZXWWQJALMNLSGAIKLESMHLAAMAMNISABMGWHWEIZXWSYWEZVEQPKMTFAIA
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Poe, keyed at sea

Easy
APCWTZORABGZRSHHJBJJOLGEGGRASYAPBWWKZIWNECRXRKCNCZTYNJNXYENKXCBSNBJSAFLYREGAQLTJOPYWCWPEOJL
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Austen under a harbour light

Medium
ZHJJOYQGYUUEZFNKWRWPTBMHUMVQKOBWOIHROAZTBLWWFBBJULDJWNPIJNBDCALNAOCMAIUEDOXJVQDSEFOEOMMBSJCW
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Hamlet, admiral's dispatch

Hard
HPLEDJYMKTUQWSTDTAZHEWNSEZHDMQQBNHEWMTAZNXZSIRJNSTZAAEXSMLSDMWUHWIQGSYUDZFRJUMHUUMMRHMMCNMRI
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Created by Denys Grybov in 2021

v.0.4.0 // released on 27.10.2026