XOR Verschlüsselung

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private string XorEncrypt(string text, int key)
        {
            string newText = "";

            for (int i = 0; i < text.Length; i++)
            {
                int charValue = Convert.ToInt32(text[i]); //get the ASCII value of the character
                charValue ^= key; //xor the value

                newText += char.ConvertFromUtf32(charValue); //convert back to string
            }

            return newText;
        }