Classic Cipher : Vernam Cipher in Python (Decrypt)

Vernam Cipher in Python (Encrypt) : http://www.johanwahyudi.com/2016/11/classic-cipher-vernam-cipher-in-python.html Code : Output : ... thumbnail 1 summary

8 years ago

Vernam Cipher in Python (Encrypt) : http://www.johanwahyudi.com/2016/11/classic-cipher-vernam-cipher-in-python.html
Code :

	#!/usr/bin/env python
	import random
	import string
	from operator import xor
	def vernam_dec(key):
	#ciphertext diambil dari file karena waktu di copy manual hasil konversi sering berbeda
	textcipher = open('ciphertext.txt','r').read()
	#fungsi convert ke desimal text
	convdecimal = []
	for i in range(len(textcipher)):
	convdecimal.append(str(ord(textcipher[i])))
	decimal = ' '.join(convdecimal)
	print decimal
	#fungsi convert ke biner
	convbiner = []
	for i in range(len(convdecimal)):
	convbiner.append(str(bin(int(convdecimal[i]))[2:].zfill(8)))
	biner = ''.join(convbiner)
	print "hasil konversi ke biner karakter Ciphertext : "
	print ' '.join(convbiner)

	#perintah convert key ke desimal
	convkeydecimal = []
	for i in range(len(key)):
	convkeydecimal.append(str(ord(key[i])))
	keydecimal = ' '.join(convkeydecimal)
	#fungsi conver key ke biner
	convkeybiner = []
	for i in range(len(convkeydecimal)):
	convkeybiner.append(str(bin(int(convkeydecimal[i]))))
	binerkey = ''.join(convkeybiner)
	print "Hasil Konversi ke biner karakter kunci :"
	print ' '.join(convkeybiner)
	#fungsi replace biner ciphertext
	binercipher =biner.replace("b","")
	print "biner Ciphertext : \n"+binercipher
	#fungsi replace biner kunci
	binerkey =binerkey.replace("b","")
	print "biner kunci : \n"+binerkey
	#fungsi xor variabel pesan dan key
	ciphertext = []
	for i in range(len(binercipher)):
	ciphertext.append(xor(int(binercipher[i]),int(binerkey[i])))
	cipherfix =''.join(map(str,ciphertext))
	splits=[cipherfix[x:x+8] for x in range(0,len(cipherfix),8)]
	print "Hasil XOR variabel ciphertext dan kunci : \n"+str(splits)
	#fungsi convert ke hexa
	hexa = []
	for i in range(len(splits)):
	hexa.append(hex(int(splits[i],2)))
	print "Hasil KOnversi hasil XOR ke hexa : \n"+str(hexa)
	#fungsi convert ke desimal
	dec = []
	for i in range(len(hexa)):
	dec.append(int(hexa[i], 16))
	print "Hasil Konversi ke Desimal : \n"+str(dec)
	#fungsi convert ke ascii text
	teks = []
	for i in range(len(dec)):
	teks.append(chr(dec[i]))
	print "Gotcha!, Plaintext : "
	return ''.join(teks)


	def main():
	print "Vernam Cipher Dekriptor (ciphertext dari file)"
	key = raw_input("Masukkan key : ")
	print vernam_dec(key)
	if __name__ == '__main__':
	main()