Mutual Information Analysis

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Mutual Information Analysis
We propose a generic information-theoretic distinguisher for differential side-channel analysis. Our model of side-channel leakage is a refinement of the one given by Standaert et al. An embedded device containing a secret key is modeled as a black box with a leakage function whose output is captured by an adversary through the noisy measurement of a physical observable. Although quite general, the model and the distinguisher are practical and allow us to develop a new differential side-channel attack. More precisely, we build a distinguisher that uses the value of the Mutual Information between the observed measurements and a hypothetical leakage to rank key guesses. The attack is effective without any knowledge about the particular dependencies between measurements and leakage as well as between leakage and processed data, which makes it a universal tool. Our approach is confirmed by results of power analysis experiments. We demonstrate that the model and the attack work effectively ...
Benedikt Gierlichs, Lejla Batina, Pim Tuyls, Bart
Added 12 Oct 2010
Updated 12 Oct 2010
Type Conference
Year 2008
Where CHES
Authors Benedikt Gierlichs, Lejla Batina, Pim Tuyls, Bart Preneel
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