Clock, power, and EM glitching discussions. Does not need to use ChipWhisperer.
#1444 by Hello Friend
Tue Jul 04, 2017 12:47 am
Hello friends,

I am trying to learn side channel attacks with a two-part chipwhisperer-lite board. From reading the documentation, I understand that the chipwhisperer lite board itself has two integrated mosfet power grounding things (uh... crowbars?) which let you connect a power wire to the "glitch" port, and then activate a mosfet from software to connect this wire to ground for a short glitch duration.

Is it possible to use the chipwhisperer with an external crowbar (i.e. connect the board itself to something else, and have it activate an external mosfet / other thing for the duration of the glitch)?

Thankyou!
#1446 by gdeon
Tue Jul 04, 2017 8:03 am
Hi there,

Sure, you can definitely do this. You can see the crowbar circuit in the CW-Lite schematic - it's on the top right of page 8. When you apply a logic high level to either of the MOSFET inputs, the glitch output acts as a short circuit to ground. If this isn't enough for you - maybe you need even more power? - it's definitely possible to connect an external crowbar circuit and control it in a similar manner.

Personally I've never needed more power than the MOSFETs on the board. Power dissipation isn't a big deal here because the glitch pulses are so short (at worst, you're looking at a ~20 us short circuit).

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