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vignere_cipher.cpp
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vignere_cipher.cpp
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#include <iostream>
#include <string>
using namespace std;
class Vig {
public:
string k;
Vig(string k) {
for (int i = 0; i < k.size(); ++i) {
if (k[i] >= 'A' && k[i] <= 'Z')
this->k += k[i];
else if (k[i] >= 'a' && k[i] <= 'z')
this->k += k[i] + 'A' - 'a';
}
}
string encryption(string t) {
string output;
for (int i = 0, j = 0; i < t.length(); ++i) {
char c = t[i];
if (c >= 'a' && c <= 'z')
c += 'A' - 'a';
else if (c < 'A' || c > 'Z')
continue;
output += (c + k[j] - 2 * 'A') % 26 + 'A'; //added 'A' to bring
//it in range of ASCII alphabet [ 65-90 | A-Z ]
j = (j + 1) % k.length();
}
return output;
}
string decryption(string t) {
string output;
for (int i = 0, j = 0; i < t.length(); ++i) {
char c = t[i];
if (c >= 'a' && c <= 'z')
c += 'A' - 'a';
else if (c < 'A' || c > 'Z')
continue;
output += (c - k[j] + 26) % 26 + 'A';//added 'A' to bring it in
//range of ASCII alphabet [ 65-90 | A-Z ]
j = (j + 1) % k.length();
}
return output;
}
};
int main() {
Vig v("WELCOME");
string ori ="Thisistutorialspoint";
string encrypt = v.encryption(ori);
string decrypt = v.decryption(encrypt);
cout << "Original Message: "<<ori<< endl;
cout << "Encrypted Message: " << encrypt << endl;
cout << "Decrypted Message: " << decrypt << endl;
}