public String encrypt(String cleartext, String method)
  {
    if ("MD5".equalsIgnoreCase(method))
      return md5hash(cleartext);
    else if ("ROT13".equalsIgnoreCase(method))
      return rot13(cleartext);
    else if ("Reverse".equalsIgnoreCase(method))
      return reverse(cleartext);
    else
      return "<blink>Unsupported encryption method: " + method + "</blink>";
  }
