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Enigma Ring Settings

a guest Jun 15th, 2019 190 Never
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  1. def get_index(letter, alphabet):
  2.         '''Get index of letter in alphabet'''
  3.         for i in range(0, len(alphabet)):
  4.             if alphabet[i] == letter:
  5.                 return i
  6.  
  7.  
  8. def shift(letter, shift, alphabet):
  9.         '''Shift letter up/down in the alphabet by given shift'''
  10.         for i in range(0, len(alphabet)):
  11.             if alphabet[i] == letter:
  12.                 return alphabet[(i + shift) % len(alphabet)]
  13.  
  14.  
  15. import sys
  16.  
  17. print("################################################\n\n")
  18. # Alphabet variable
  19. alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
  20. # Set ringstellung
  21. ringstellung = get_index(sys.argv[1].upper(), alphabet)
  22. print("Ringstellung: " + str(ringstellung))
  23. # Set wiring variable
  24. wiring = "EKMFLGDQVZNTOWYHXUSPAIBRCJ"
  25. # Set dot position to postion of A in current wiring
  26. dot_position = get_index("A", wiring)
  27. print("Dot position: " + str(dot_position))
  28. # Loop over all letters before ringstellung (in the alpabet); e.g.: ringstellung 5: loop: 0, 1, 2, 3, 4
  29. for i in range(0, ringstellung):
  30.     # Set temporary wiring variable
  31.     temp_wiring = wiring
  32.     # Set acutall wiring to empty string
  33.     wiring = ""
  34.     # Loop over chars in temporary wiring
  35.     for char in temp_wiring:
  36.         # Shift the char by one and add that shiftet char to wiring variable
  37.         wiring += shift(char, 1, alphabet)
  38.     # Add one to dot position, make sure we don't exceed the lenght of the alphabet
  39.     dot_position = (dot_position + 1) % len(alphabet)
  40.     print("Wiring shiftet up the alphabet: " + wiring)
  41.     print("New dot position: " + str(dot_position))
  42. i = 0;
  43. # While the letter at the dot position doesn't match with the ringstellung
  44. while not wiring[dot_position] == alphabet[ringstellung]:
  45.     i += 1;
  46.     # Rotate the wiring
  47.     wiring = wiring[-1:] + wiring[:-1]
  48.     print("Rotation " + str(i).zfill(2) + "; Wiring: " + wiring)
  49.  
  50. print("--------------------------------------")
  51. print("Ringstellung: " + alphabet[ringstellung])
  52. print("Final mapping:")
  53. print(alphabet)
  54. print("↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓")
  55. print(wiring)
  56. print("--------------------------------------")
  57. print("################################################\n\n")
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