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Training

939 bytes added, 21:33, 6 August 2018

→‎DPA Lab Slides

[[:File:3.1 - DPA Lab 1B (Basic AES Attack) DPA Attack.pptx]]

from chipwhisperer.common.api.CWCoreAPI import CWCoreAPI

from matplotlib.pylab import *

import numpy as np

cwapi = CWCoreAPI()

cwapi.openProject(r'/home/cwuser/chipwhisperer/projects/dpa_dem.cwp')

tm = cwapi.project().traceManager()

ntraces = tm.numTraces()

npoints = tm.numPoints()

#We will store 0-guess here

zeroguess = np.zeros((1,npoints))

#We will store 1-guess here

oneguess = np.zeros((1,npoints))

bytenum = 0

bit = 0

##BITWISE GUESS STARTS HERE

#Count 1 and 0 for averaging

numone = 0

numzero = 0

#Do each trace loop

for n in range(0, ntraces):

trace = tm.getTrace(n)

tin = tm.getTextin(n)

if tin[bytenum] & (1<<bit):

oneguess += trace

numone += 1

else:

zeroguess += trace

numzero += 1

oneguess = oneguess / float(numone)

zeroguess = zeroguess / float(numzero)

diff = (oneguess - zeroguess).T

plot(diff)

show()

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