[irsagent]

Very well written article. I have been looking for some inspiration to get into hardware hacking and I think this article did it for me.

I find it interesting that in most writeups voltage injection is a popular appraoch to turning on debug mode. The aricle makes mention to other class of fault injection attack such as clock glitching or electromagnetic fault injection, but are there other approaches that I could look into, just out of curiousity?

[redfast00]

Voltage injection is (IMO) the easiest attack. There's also optical fault injection, where you remove the black encapsulation from the chip and hit the bare die with a laser (that sounds really difficult though).

On some chips, you can drill into the black encapsulation and find testpads that are not connected to pins on the IC. This is sometimes used for smartphone unlocking.

Edit: Thanks for the compliment by the way, it really made my day that I got someone interested in hardware hacking