int compareKey() {
    unsigned int leng = strleng(keyInput);
    unsigned int correctLeng = strleng(correctKey);
    int i, randomTime, falseKey = 0;

    unsigned int seed = getpid() + keyInput[0];
    srand(seed);  // initialize the random seed

    if (leng != correctLeng)
        return 1;

    for (i = correctLeng-1; i >= 0; i--) {
        if (keyInput[i] != correctKey[i]) {
            usleep(500000);  // that delay will stop bruteforce attack

            falseKey = 1;
        }
    }
    randomTime = 500000 * (rand() % 3);
    usleep(randomTime); // take that
    // and this will prevent the attacker to perform a timed attack

    return falseKey;
}