lab7

 #include <iostream>

#include <string>

using namespace std;

string xorOp(const string &text, const string &key) {

    string res = text;

    for (size_t i = 0; i < text.size(); i++)

        res[i] = text[i] ^ key[i % key.size()];

    return res;

}

int main() {

    string pt, key, enc, dec, inKey;

    cout << "Enter text: ";

    getline(cin, pt);

    cout << "Enter key: ";

    getline(cin, key);

    enc = xorOp(pt, key);

    cout << "Encrypted: ";

    for (char c : enc) cout << hex << (int)(unsigned char)c << " ";

    cout << "\nEnter key to decrypt: ";

    getline(cin, inKey);

    dec = xorOp(enc, inKey);

    cout << (dec == pt ? "Decryption successful: " + dec : "Decryption failed!") << endl;

    return 0;

}