Hints

• What can you see on the default serial interface?
• The password is using ASCII characters taken from the decimal range 33 (!) to 126 (~).
• For the duration of the password verification, the pin 13 is pulled high. It stays low otherwise.
• The first character of the password is f
• A good strategy for power analysis is to capture multiple traces for the same character, then compute the global average of all traces, and finally compute the difference between each character average and the global average.
• The moment of interest for power analysis (when the password is checked) might vary, ranging from 200th to 2000th sample.