Frequency analysis

In cryptanalysis, frequency analysis is the study of the frequency of letters or groups of letters in a ciphertext.The method is used as an aid to breaking classical ciphers.


Using the file CipherText1.txt and the following online tool:



http://crypto.interactive-maths.com/frequency-analysis-breaking-the-code.html


find the relative frequency of the letters in the ciphertext and fill in the following table on your worksheet:


Cipher text letter

A

B

C

D

E

F

G

H

I

J

K

L

M

number












percentage












plain text letter














Cipher text letter

N

O

P

Q

R

S

T

U

V

W

X

Y

Z

number












percentage












plain text letter

















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