I’ve had heaps of fun with the chipwhisperer (and poking hardware in general) so far! I’m currently trying to voltage glitch a router board I’ve got lying around, and I’ve got a few questions:
- Firstly, is there a general approach to identifying core voltage? My approach so far has been visually inspecting the target, and manually probing each point while the device is powered on, and then trying against things that look like a core voltage - but this seems like lots of guesswork. Is there a better way to do this?
- Secondly, I’m monitoring the (alleged!) core voltage and when I trigger a glitch event, shorting it to ground, I get the following trace:
This looks like to me that I’m not sinking enough power during the glitch event - and the decoupling capacitors on the board are doing their job as intended. Is this a fair interpretation (is this enough information to indicate this?)
- Thirdly, what properties should I look for in a MOSFET which make it “good for glitching”? I’m assuming activation time, a convenient threshold voltage and a suitable maximum drain/source voltage?
Thankyou in advance