public String xor(char[] toChifre, int schlüssel) {
        String verschlüsselt = "";
        //if(schlüssel != (toChifre.length())) {
        //    System.out.println("Error.Schlüssel zu kurz.");
        //} else {
            try {
                verschlüsselt  = toChifre^schlüssel;
            } catch(Exception e) {
            System.out.println("Error. Failded to XOR");
        }
        //}
        return verschlüsselt;
    }