I’m ramping up on voltage glitching, and had some questions about how to wire up target boards for a brown-out voltage glitching attack. Most sources I’ve found mention that you should remove decoupling caps to reduce the capacitance available on the board for a more effective glitch, then wire the ChipWhisperer glitch line to the voltage in line of the target board.
One modification I see recommended often when performing a brownout attack is cutting a trace from the power supply pin of the target chip. (https://www.blackhat.com/docs/eu-15/materials/eu-15-Giller-Implementing-Electrical-Glitching-Attacks.pdf Slide 28)
What would be the purpose of this? How would the chip continue to receive power if this trace is cut? As far as I understand, the CW glitch line does not provide power to the board.
Thanks in advance, having a great time learning!