ches rump session, september, 15 th, 2015 korea university seokhie hong, taewon kim, sangyub lee...
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CHES Rump Session, September, 15th, 2015
Korea University Seokhie Hong, Taewon Kim, Sangyub LEE
Most Important thing in black box test
CHIPCome at me Bro
Break me now
I’m in printer
AES
3
WORRYANXIETY
NERVOUSFEAR
STRESS
STRESS
My PreciousMy Preciouss
My PreciousssMy Precioussss
My Precioussssssss
4
5
STEP 2
Alignment(horizontal/vertical)
Compression
Principal Component Analysis
Linear Discrimination Analysis
Frequency domain
STEP 1
Visual inspection
PC
Oscilloscope
Reader
Band Pass Filter
command
PowerEM
filtered signal
response
store signals
iteration
Ampli-fier
Measuring weak signal
STEP 3
……as alwaysKey doesn’t come out easily…
SNR? Power Model??
Countermeasure?
Any others??
GO Go GO!!!
I’m cool
Don’t care
Not going good…
WHY NOT??!!!!
THIS MIGHT BE IT!!!!
Let me see...
FFFFFFFFFFFFFFFFFFFFFF
8
Where is my key
Where is my peaks
9
At last ..4 month laterAfter many trials and errors…We finally found ‘the KEY’ at last..
10
Pre-processing
Distinguisher
Power Model
Enough Trace
11
Pre-processing
Distinguisher
Power Model
Enough Trace
King of
Mental
Most important thing is...
Thank you
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