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p59.py
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p59.py
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# -*- coding: utf-8 -*-
"""
Created on Fri Mar 24 19:33:23 2017
@author: Refaia
"""
import time
def getKey(cipher, sizeKey) :
freqNumInABC = [{}, {}, {}]
key = [0 for i in range(sizeKey)]
for i in range(sizeKey) :
maxValue = 0
for j in range(i, len(cipher), 3) :
if cipher[j] in freqNumInABC[i] :
freqNumInABC[i][cipher[j]] += 1
else :
freqNumInABC[i][cipher[j]] = 1
if freqNumInABC[i][cipher[j]] > maxValue :
maxValue = freqNumInABC[i][cipher[j]]
key[i] = cipher[j]
for i in range(sizeKey) :
key[i] = key[i] ^ ord(' ')
return key
def decryptMsg(cipher, key) :
plaineTxtASCII = []
for i in range(0, len(cipher), 3) :
tmp = cipher[i: i + len(key)]
plaineTxtASCII += [a ^ b for a, b in zip(tmp, key)]
return plaineTxtASCII
def main() :
delta = time.time()
f = open('p059_cipher.txt', 'r')
cipher = f.read().split(',')
cipher[-1] = cipher[-1][:-1]
cipher = list(map(int, cipher))
sizeKey = 3
key = getKey(cipher, sizeKey)
decryptedMsgASCII = decryptMsg(cipher, key)
sumASCII = sum(decryptedMsgASCII)
decryptedMsg = "".join(chr(a) for a in decryptedMsgASCII)
delta = time.time() - delta
return sumASCII, delta
print(main())