Having trace.pkl file and title with keyword "power" we know thats it's an Power Analysis task.
In task said it's an signature generation function, by task name keyword "tokens" we can assume it's RSA.

If we plot some of our data list, we get something like:

Can you see impulses?

Main idea of Power analysis is that different instructions have different power consumption patterns.

RSA signature generation:

short+long=1, short=0. Simple, hah?

Sources included.

Thanks to @hellman1908 for error corection!

If we plot some of our data list, we get something like:

Can you see impulses?

Main idea of Power analysis is that different instructions have different power consumption patterns.

RSA signature generation:

S = M^d mod N or S=1 for i =L-1 downto 0: S = S^2 mod N if di == 1: S = S * M mod NFor every bit of d we've square and if bit = 1 we've multiplication also. So we just check our data for duration patterns:

short+long=1, short=0. Simple, hah?

Sources included.

Thanks to @hellman1908 for error corection!