Program Vigenere Chiper C++

Program Vigenere Chiper C++

Vigenere Chiper Adalah Teknik atau Metode menyandikan Plaintext menggunakan deretan sandi Caesar berdasarkan huruf pada kata kunci.

Berikut Source Code nya :

#include <iostream>
#include <string>

using namespace std;

class Vigenere {

 public:
  string key;
  Vigenere(string key)
  {
  for(int i = 0; i < key.size();++i)
  {
  if (key[i] >= 'A' && key [i] <= 'Z')
  this->key += key [i];
  else if (key[i] >= 'a' && key[i] <= 'z')
  this->key += key [i] + 'A' - 'a';
  }
  }
  string encrypt(string text)
  {
  string out;
 
  for (int i = 0, j = 0; i < text.length(); ++i)
  {
  char c = text[i];
 
if (c >= 'a' && c<= 'z')
c += 'A' - 'a';
else if ( c < 'A' || c> 'Z')
continue;

out += (c +key[j] -2 * 'A') %26 +'A';
j = (j +1) % key.length();
}

return out;
}
string decrypt(string text)
{
string out;

for (int i = 0, j = 0; i < text.length(); ++i)
  {
  char c = text[i];
 
if (c >= 'a' && c<= 'z')
c += 'A' - 'a';
else if ( c < 'A' || c> 'Z')
continue;

out += (c - key[j] +26 ) %26 +'A';
j = (j +1) % key.length();
}

return out;
}
};
int main(){
string original="KORUPTOR";
Vigenere chiper("MATI");

string encrypted = chiper.encrypt(original);
string decrypted = chiper.decrypt(encrypted);
cout<<original<<endl;
cout<<"encrypted :"<<encrypted<<endl;
cout<<"decrypted :"<<decrypted<<endl;
}

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