if (!empty($phpThumb->config_high_security_enabled)) {
    if (empty($_GET['hash'])) {
        $phpThumb->config_disable_debug = false; // otherwise error message won't print
        $phpThumb->ErrorImage('ERROR: missing hash');
    } elseif (phpthumb_functions::PasswordStrength($phpThumb->config_high_security_password) < 20) {