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  1. // C++ code to implement Hill Cipher 
  2. #include <iostream> 
  3. using namespace std; 
  4.  
  5. // Following function generates the 
  6. //  key matrix for the key string 
  7. void getKeyMatrix(string key, int keyMatrix[][3]) 
  8. { 
  9.     int k = 0; 
  10.     for (int i = 0; i < 3; i++)  
  11.     { 
  12.         for (int j = 0; j < 3; j++)  
  13.         { 
  14.             keyMatrix[i][j] = (key[k]) % 65; 
  15.             k++; 
  16.         } 
  17.     } 
  18. } 
  19.  
  20. // Following function encrypts the message 
  21. void encrypt(int cipherMatrix[][1], 
  22.              int keyMatrix[][3],  
  23.              int messageVector[][1]) 
  24. { 
  25.     int x, i, j; 
  26.     for (i = 0; i < 3; i++)  
  27.     { 
  28.         for (j = 0; j < 1; j++) 
  29.         { 
  30.             cipherMatrix[i][j] = 0; 
  31.  
  32.              for (x = 0; x < 3; x++) 
  33.             { 
  34.                 cipherMatrix[i][j] +=  
  35.                      keyMatrix[i][x] * messageVector[x][j]; 
  36.             } 
  37.  
  38.             cipherMatrix[i][j] = cipherMatrix[i][j] % 26; 
  39.         } 
  40.     } 
  41. } 
  42.  
  43. // Function to implement Hill Cipher 
  44. void HillCipher(string message, string key) 
  45. { 
  46.     // Get key matrix from the key string 
  47.     int keyMatrix[3][3]; 
  48.     getKeyMatrix(key, keyMatrix); 
  49.  
  50.     int messageVector[3][1]; 
  51.  
  52.     // Generate vector for the message 
  53.     for (int i = 0; i < 3; i++) 
  54.         messageVector[i][0] = (message[i]) % 65; 
  55.  
  56.     int cipherMatrix[3][1]; 
  57.  
  58.     // Following function generates 
  59.     // the encrypted vector 
  60.     encrypt(cipherMatrix, keyMatrix, messageVector); 
  61.  
  62.     string CipherText; 
  63.  
  64.     // Generate the encrypted text from  
  65.     // the encrypted vector 
  66.     for (int i = 0; i < 3; i++) 
  67.         CipherText += cipherMatrix[i][0] + 65; 
  68.  
  69.     // Finally print the ciphertext 
  70.     cout << " Ciphertext:" << CipherText; 
  71. } 
  72.  
  73. // Driver function for above code 
  74. int main() 
  75. { 
  76.     // Get the message to be encrypted 
  77.     string message = "ACT"; 
  78.  
  79.     // Get the key 
  80.     string key = "GYBNQKURP"; 
  81.  
  82.     HillCipher(message, key); 
  83.  
  84.     return 0; 
  85. }
Success #stdin #stdout 0s 15240KB
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 Ciphertext:POH
https://ideone.com/9nGX8G
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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