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→Finding SPA Leakage
And you can see the power trace change drastically, as below:
Finally, let's flip another bit. Change the input plaintext as follows, such that bit #4 in the final bit is set HIGH. We can plot the two power traces on top of each other, and you see that they are differing at a specific point in time:
Walking back from the right, you can see this almost directly matches bit numbering for those last two bytes:
With a bit of setup done, we can now perform a few captures.