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  1.     #Stops the program going over the 25 (because 26 would be useless)
  2. #character limit
  3. MAX = 25
  4.  
  5. #Main menu and ensuring only the 3 options are chosen
  6. def getMode():
  7.     while True:
  8.         print('Main Menu: Encrypt (e), Decrypt (d), Stop (s), Block Encrypt (be).')
  9.         mode = input().lower()
  10.         if mode in 'encrypt e decrypt d block encrypt be'.split():
  11.             return mode
  12.         if mode in 'stop s'.split():
  13.             exit()
  14.         else:
  15.             print('Please enter only "encrypt", "e", "decrypt", "d", "stop", "s" or "block encrypt", "be"')
  16.  
  17. def getMessage():
  18.     print('Enter your message:')
  19.     return input()
  20.  
  21. #Creating the offset factor 
  22. def getKey():
  23.     key = 0
  24.     while True:
  25.         print('Enter the offset factor (1-%s)' % (MAX))
  26.         key = int(input())
  27.         if (key >= 1 and key <= MAX):
  28.             return key
  29.  
  30. #Decryption with the offset factor       
  31. def getTranslatedMessage(mode, message, key):
  32.     if mode[0] == 'd':
  33. #The key is inversed so that it simply takes away the offset factor instead
  34. #of adding it        
  35.         key = -key
  36.     translated = ''
  37.  
  38.     if mode == 'be':
  39.         message = message.replace(" ","")
  40.  
  41.         #The spaces are all removed for the block encryption
  42.  
  43. #Ensuring that only letters are attempted to be coded
  44.     for symbol in message:
  45.         if symbol.isalpha():
  46.             number = ord(symbol)
  47.             number += key
  48. #Ensuring the alphabet loops back over to "a" if it goes past "z"
  49.             if symbol.isupper():
  50.                 if number > ord('Z'):
  51.                     number -= 26
  52.                 elif number < ord('A'):
  53.                     number += 26
  54.             elif symbol.islower():
  55.                 if number > ord('z'):
  56.                     number -= 26
  57.                 elif number < ord('a'):
  58.                     number += 26
  59.  
  60.             translated += chr(number)
  61.         else:
  62.             translated += symbol
  63.     return translated
  64. #Returns translated text
  65.  
  66. mode = getMode()
  67. message = getMessage()
  68. key = getKey()
  69. #Retrieving the mode, message and key
  70.  
  71. print('The translated message is:')
  72. print(getTranslatedMessage(mode, message, key))
  73. #Tells the user what the message is
Success #stdin #stdout 0.02s 8688KB
comments (?)
stdin
copy 
be
ab cd ef
2
stdout
copy 
Main Menu: Encrypt (e), Decrypt (d), Stop (s), Block Encrypt (be).
Enter your message:
Enter the offset factor (1-25)
The translated message is:
cdefgh
https://ideone.com/kjDihG
language:
Python 3 (python  3.12)
created:
10 years ago
visibility:
secret

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