Skip to main content
The National Cipher Challenge

Substitution tool

To use the substitution tool….

Key
Plaintext
CIPHERTEXT
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
Ciphertext

PASTE text into this area

'Original' Ciphertext

Report a problem