how to do frequency analysis in python code example
Example: easy frequency analysis python
import collections
ALPHABET = "abcdefghijklmnopqrstuvwxyz"
ETAOIN = 'etaoinshrdlcumwfgypbvkjxqz'
def generate_caesar_key(offset):
dictionary = {}
index = 0
for letter in ALPHABET:
if index+offset >= 26:
index -= 26
dictionary.update({letter:ALPHABET[index+offset]})
index += 1
return dictionary
def switch_encode(string, key):
encoded = ""
for letter in string.lower():
if letter in key.keys():
encoded += key[letter]
else:
encoded += letter
return encoded
def switch_decode(string, key):
key = dict(zip(key.values(),key.keys()))
decoded = ""
for letter in string.lower():
if letter in key.keys():
decoded += key[letter]
else:
decoded += letter
return decoded
def switch_crack(string):
key = {}
frequent_letters = collections.Counter(string).most_common()
index = 0
for letter in frequent_letters:
if letter[0] in ALPHABET:
key[ETAOIN[index]] = letter[0]
index += 1
return key