Classical Cryptography

Substitution Cipher Cryptanalysis Interactive Demo


STEP 1. INPUT PLAINTEXT AND CIPHERTEXT

The step shows letter frequencies for both plaintext and ciphertext. It also shows some of the most common digraphs and trigraphs for help in decoding the cipher text.

Ciphertext



RESULT OF STEP 1.

Table of Ciphertext letter frequencies.

Letter
Frequency
Letter
Frequency
A
N
B
O
C
P
D
Q
E
R
F
S
G
T
H
U
I
V
J
W
K
X
L
Y
M
Z



STEP 2. ATTEMPT TO DECODE THE CIPHERTEXT

At this point, enter in your guesses for the cipher text, and click on update to update the cipher text with the new letters. Reset will reset your guesses to all dashes.

Cipher Alphabet
A
B
C
D
E
F
G
H
I
J
K
L
M
Plaintext Alphabet

Cipher Alphabet
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
Plaintext Alphabet