&gt; For example changing the WiFi or Bluetooth MAC is not locked down and effects the UDID. Because the UDID was never intended to be a way to bypass the device encryption it was not designed with anywhere near the same level of care and sophistication as handling the encryption key itself.<p>I never suggested the UDID. Please don&#x27;t ascribe a claim to me that was never made. SHA512 the serial and macs independently. Job done.