Olivia needs to ensure an IoT device does not have its operating system modified by third parties after it is sold. What solution should she implement to ensure that this does not occur?

If Olivia wants to ensure that third parties will be unable to modify the operating system for Internet of Things (IoT) devices, requiring signed and encrypted firmware for operating system updates is an effective means of stopping all but the most advanced threats. Setting a default password means that a common password will be known. Checking the MD5sum for new firmware versions will help administrators validate that the firmware is legitimate, but signed and encrypted firmware is a much stronger control. Finally, regular patching may help secure the devices but won't prevent OS modifications.