PYTHON: Please provide an Index of Coincidence (IC) program using PYTHON. The program should take a...
PYTHON:
Please provide an Index of Coincidence (IC) program using PYTHON. The program should take a ciphertext string as input and output the IC value.
this website allows you to calculate the IC of a string of text: http://practicalcryptography.com/cryptanalysis/text-characterisation/index-coincidence/
but I'm looking for a program.
Homework Answers
CODE
==============
import sys
import collections
cipher_text = input("Enter the ciphertext: ")
# remove all non alpha and whitespace and force uppercase
# SOTHATCIPHERTEXTLOOKSLIKETHIS
cipher_flat = "".join(
[x.upper() for x in cipher_text.split()
if x.isalpha() ]
)
# Tag em
N = len(cipher_flat)
freqs = collections.Counter( cipher_flat )
alphabet = map(chr, range( ord('A'), ord('Z')+1))
freqsum = 0.0
# Do the math
for letter in alphabet:
freqsum += freqs[ letter ] * ( freqs[ letter ] - 1 )
IC = freqsum / ( N*(N-1) )
print "%.3f" % IC, "({})".format( IC )
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