In the high level block diagram of a PCB used in a TV set top box the Digital Right Management (DRM) key is stored in a non-volatile memory (NVM) which goes to a comparator that generates the channel...

In the high level block diagram of a PCB used in a TV set top box the Digital Right Management (DRM) key is stored in a non-volatile memory (NVM) which goes to a comparator that generates the channel grant access signal. Describe a possible tampering attack that can bypass this protection. You can update the drawing to illustrate your attack. You need to incorporate your attack within the dotted box.

1. What would be a possible solution to protect against the aforementioned tampering attacks?

2. What is PCB reverse engineering?