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Optical Side Channel Method
J. Di-Battista, M. Hlavac, J.-Ch. Courrege, J. Ferrigno
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This presentation, based on the work of Martin Hlavac
and which serves to starting point to my thesis subject, talk about
a newly emerging side channel - optical side channel.
The basic idea is simple - nowadays the integrated ciruits are composed
of many transistors, naively we can say that these transistors represent
one of the two logical states (0 or 1). When the state changes, there
is some light that is emmited in form of few photons. The method which
is able to detect these photons is called picosecond imaging circuit analysis.
From the point of view of the cryptanalyst, with light emission information
about a specific cipher algorithm on a device, he is able to identify
secret sensible data. On this presentation the method was used on an
out-dated and unprotected microcontroller PIC16F84A and the results show
that it is possible to recover the AES secret key directly during the
initial AddRoundKey operation (XOR operation between key and plaintext). |
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