CODE C++ ALGORITMA ENCRYPTED DAN DECRYPTED VIGENERE CHIPPER

Algoritma Vigenere Chipper 

CARA MENJALANKANNYA DI DEV C++

#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 a,b;

cout<<"Masukan Plaintext: ";

cin>>a;

cout<<"Masukan Key :";

cin>>b;

string original=a;

Vigenere chiper=b;

string encrypted = chiper.encrypt(original);

string decrypted = chiper.decrypt(encrypted);

cout<<endl;

cout<<"encrypted :"<<encrypted<<endl;

cout<<"decrypted :"<<decrypted<<endl;

}

Selamat Mencoba :)

@medidarmawan
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