import numpy
import timeit
import sys

"""
This method encrypt any plaintext and compute its
cipher text using one-time pad.

Example:
python otp.py enc ../data/key.txt ../data/plaintext.txt ../data/ciphertext.txt
"""
def encryption(key_path, text_path, cipher_path):
key = ''
plain_text = ''
# reading key file
with open(key_path, 'r') as f:
   key = f.read()

# reading plain text file
with open(text_path, 'r') as f:
   text = f.read()
   for i in range(len(text)):
         v = ord(text[i])
         plain_text += '{0:08b}'.format(v)

cipher_text = ''

# checking if plain text length matches with key length
if len(plain_text) != len(key):
   print ("error: length is incorrect!")
else:
   # Building cipher text
   for i in range(len(plain_text)):
         k = int(key[i])
         t = int(plain_text[i])
         v = k ^ t
         cipher_text += str(v)
   #print (cipher_text)

with open(cipher_path, 'w') as f:
   f.write(cipher_text)

"""
Decryption function should be able to decrypt any ciphertext.

Example:
python otp.py dec ../data/key.txt ../data/ciphertext.txt ../data/result.txt
"""
def decryption(key_path, cipher_path, result_path):
key = ''
cipher_text = ''
result_text = ''
plain_text

Chapter 4 Many studies have been done that indicate the maximum he...