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>Decrypt / Keyword substitution
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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
Learn
History
Practice
Message
i
i
Free alphabet
Continue after the keyword
i
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
Top row: plain alphabet. Bottom row: the cipher alphabet it maps to.
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Created by Denys Grybov in 2021
v.0.4.0 // released on 20.10.2026