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  1. #include <stdio.h>
  2.  
  3. def translate(x): #helper function used to translate a letter into a number
  4.     if x == 'A':
  5.         return 0
  6.     elif x == 'B':
  7.         return 1
  8.     elif x == 'C':
  9.         return 2
  10.     elif x == 'D':
  11.         return 3
  12.     elif x == 'E':
  13.         return 4
  14.     elif x == 'F':
  15.         return 5
  16.     elif x == 'G':
  17.         return 6
  18.     elif x == 'H':
  19.         return 7
  20.     elif x == 'I':
  21.         return 8
  22.     elif x == 'J':
  23.         return 9
  24.     elif x == 'K':
  25.         return 10
  26.     elif x == 'L':
  27.         return 11
  28.     elif x == 'M':
  29.         return 12
  30.     elif x == 'N':
  31.         return 13
  32.     elif x == 'O':
  33.         return 14
  34.     elif x == 'P':
  35.         return 15
  36.     elif x == 'Q':
  37.         return 16
  38.     elif x == 'R':
  39.         return 17
  40.     elif x == 'S':
  41.         return 18
  42.     elif x == 'T':
  43.         return 19
  44.     elif x == 'U':
  45.         return 20
  46.     elif x == 'V':
  47.         return 21
  48.     elif x == 'W':
  49.         return 22
  50.     elif x == 'X':
  51.         return 23
  52.     elif x == 'Y':
  53.         return 24
  54.     elif x == 'Z':
  55.         return 25
  56.  
  57. def backToLetter(x):  #a helper function used to turn a number back into a letter
  58.     if x == 0:
  59.         return 'A'
  60.     elif x == 1:
  61.         return 'B'
  62.     elif x == 2:
  63.         return 'C'
  64.     elif x == 3:
  65.         return 'D'
  66.     elif x == 4:
  67.         return 'E'
  68.     elif x == 5:
  69.         return 'F'
  70.     elif x == 6:
  71.         return 'G'
  72.     elif x == 7:
  73.         return 'H'
  74.     elif x == 8:
  75.         return 'I'
  76.     elif x == 9:
  77.         return 'J'
  78.     elif x == 10:
  79.         return 'K'
  80.     elif x == 11:
  81.         return 'L'
  82.     elif x == 12:
  83.         return 'M'
  84.     elif x == 13:
  85.         return 'N'
  86.     elif x == 14:
  87.         return 'O'
  88.     elif x == 15:
  89.         return 'P'
  90.     elif x == 16:
  91.         return 'Q'
  92.     elif x == 17:
  93.         return 'R'
  94.     elif x == 18:
  95.         return 'S'
  96.     elif x == 19:
  97.         return 'T'
  98.     elif x == 20:
  99.         return 'U'
  100.     elif x == 21:
  101.         return 'V'
  102.     elif x == 22:
  103.         return 'W'
  104.     elif x == 23:
  105.         return 'X'
  106.     elif x == 24:
  107.         return 'Y'
  108.     elif x == 25:
  109.         return 'Z'
  110.  
  111. def affineCrypt(plaintext):               #a function representing the Affine Cipher. Takes a string input
  112.     newtext = plaintext.replace(" ", '')  #replacing all spaces
  113.     p = 0
  114.     i = ""
  115.     c = ""
  116.     for x in newtext:                     #going through each letter of the plaintext
  117.         p = translate(x)                  #translating each letter into a number
  118.         c += backToLetter(((5*p)+9) % 26) #employ the formula and turn the result back into a letter and place it into the ciphertext string
  119.     return c
  120.  
  121. if __name__ == "__main__":
  122. 	plaintext = "CRYPTOISFUN"
  123. 	print(affineCrypt(plaintext))
Success #stdin #stdout 0.04s 9652KB
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https://ideone.com/LWloCA
language:
Python 3 (python  3.9.5)
created:
7 days ago
visibility:
public

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