I attempted to capture waveforms for performing DPA in Tutorial 3-3 on the ChipWhisperer Nano, but the captured waveforms are completely different from the expected ones. Instead, I ended up with a neat rectangular waveform centered in the middle.
Personally, I suspect it might be due to a soldering issue when I split the chip into two parts for an EM attack on the ChipWhisperer Nano, or perhaps it could be caused by the jumper wires I am using.
However, I’m not entirely sure about the actual cause. If anyone knows, I would appreciate your insights.
What you’re seeing there is the least significant bits of the ADC toggling (because we can count only 9 distinct measurement levels); this is noise, not signal. This is what you’d expect to see if the measure port wasn’t connected at all, or if the target isn’t powered or clocked. In your case, this is almost certainly caused by poor soldering and/or missing connections.
