fork download
copy 
  1.  
  2. import math
  3.  
  4. key = "HACK"
  5.  
  6. def encryptMessage(msg):
  7. 	cipher = ""
  8.  
  9.  
  10. 	k_indx = 0
  11.  
  12. 	msg_len = float(len(msg))
  13. 	msg_lst = list(msg)
  14. 	key_lst = sorted(list(key))
  15.  
  16.  
  17. 	col = len(key)
  18.  
  19.  
  20. 	row = int(math.ceil(msg_len / col))
  21.  
  22. 	fill_null = int((row * col) - msg_len)
  23. 	msg_lst.extend('_' * fill_null)
  24.  
  25.  
  26. 	matrix = [msg_lst[i: i + col] 
  27. 			for i in range(0, len(msg_lst), col)]
  28.  
  29.  
  30. 	for _ in range(col):
  31. 		curr_idx = key.index(key_lst[k_indx])
  32. 		cipher += ''.join([row[curr_idx] 
  33. 						for row in matrix])
  34. 		k_indx += 1
  35.  
  36. 	return cipher
  37.  
  38.  
  39. def decryptMessage(cipher):
  40. 	msg = ""
  41.  
  42. 	k_indx = 0
  43.  
  44.  
  45. 	msg_indx = 0
  46. 	msg_len = float(len(cipher))
  47. 	msg_lst = list(cipher)
  48.  
  49. 	col = len(key)
  50.  
  51. 	row = int(math.ceil(msg_len / col))
  52.  
  53. 	key_lst = sorted(list(key))
  54.  
  55.  
  56. 	dec_cipher = []
  57. 	for _ in range(row):
  58. 		dec_cipher += [[None] * col]
  59.  
  60. 	for _ in range(col):
  61. 		curr_idx = key.index(key_lst[k_indx])
  62.  
  63. 		for j in range(row):
  64. 			dec_cipher[j][curr_idx] = msg_lst[msg_indx]
  65. 			msg_indx += 1
  66. 		k_indx += 1
  67.  
  68. 	try:
  69. 		msg = ''.join(sum(dec_cipher, []))
  70. 	except TypeError:
  71. 		raise TypeError("This program cannot",
  72. 						"handle repeating words.")
  73.  
  74. 	null_count = msg.count('_')
  75.  
  76. 	if null_count > 0:
  77. 		return msg[: -null_count]
  78.  
  79. 	return msg
  80.  
  81. msg = "computer networks"
  82.  
  83. cipher = encryptMessage(msg)
  84. print("Encrypted Message: {}".
  85. 			format(cipher))
  86.  
  87. print("Decryped Message: {}".
  88. 	format(decryptMessage(cipher)))
  89.  
  90.  
Success #stdin #stdout 0.03s 9684KB
comments (?)
stdin
copy 
45
stdout
copy 
Encrypted Message: otno_meer_cu wsprtk_
Decryped Message: computer networks
https://ideone.com/C3yyGJ
language:
Python 3 (python  3.9.5)
created:
13 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!