Cabinet Noir
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A substitution whose cipher alphabet is spelled out by a keyword: its letters first, then the rest in order.
Type
substitution cipher
Breaking it
easy to break by hand
Era
16th century — today
Name
A classic keyed alphabet, described in early cryptologic manuals; popular with hobbyists ever since.
Modes
encrypt · decrypt · cryptoanalysis
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Tool
Cryptoanalysis
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History
Practice
Practice
Keyword substitution
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The best of times
Easy
FT WGS TCE AEST MN TFKES FT WGS TCE WMQST MN TFKES FT WGS TCE GBE MN WFSDMK FT WGS TCE GBE MN NMMJFSCLESS FT WGS TCE SEGSML MN JFBCT
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A truth universally acknowledged
Medium
ES EQ H SPTSD TKEVOPQHIIY HRGKLWIOBCOB SDHS H QEKCIO JHK EK MLQQOQQELK LU H CLLB ULPSTKO JTQS AO EK WHKS LU H WEUO
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Four score and seven
Hard
AJSP QUJPT MHN QTVTH YTMPQ MIJ JSP AMRBTPQ OPJSIBR AJPRB JH RBCQ UJHRCHTHR M HTW HMRCJH UJHUTCVTN CH FCOTPRY MHN NTNCUMRTN RJ RBT KPJKJQCRCJH RBMR MFF GTH MPT UPTMRTN TLSMF
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Created by Denys Grybov in 2021
v.0.4.0 // released on 20.10.2026