When using CW_HUSKY with SAM4S target on SCA101/Lab2_1B, during the trace capture on “Exploration” part, the captures got random power consumption offset (see image). This is troublesome, because it doesn’t allow to make power analysis reliably and thus recover the password. Note that I don’t have…

No, this might be because of hardware optimizations, not compiler ones. There’s a hardware loop optimizer on the SAM4S which might be causing this. Try the commit that I linked, as that one disables the loop optimization. Alex

SAM4S target weird behaviour with HUSKY

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cryptolok September 5, 2023, 2:38pm 4