By C. Archambeau, E. Peeters, F. -X. Standaert, J. -J. Quisquater (auth.), Louis Goubin, Mitsuru Matsui (eds.)

These are the lawsuits of the 8th Workshop on Cryptographic and Embedded structures (CHES 2006) held in Yokohama, Japan, October 10-13, 2006. The CHES workshophas been subsidized via the overseas organization for Cryptographic examine (IACR) due to the fact that 2004. The ?rst and the second one CHES workshops have been held in Worcester in 1999 and 2000, respectively, by means of Paris in 2001, San Francisco Bay quarter in 2002, Cologne in 2003, Boston in 2004 and Edinburgh in 2005. this is often the ?rst CHES workshop held in Asia. This year,a totalof 112 paper submissionswerereceived.The reviewprocess was once hence a fragile and demanding activity for this system Committee m- bers. each one paper was once rigorously learn through a minimum of 3 reviewers, and submissions with a application Committee member as a (co-)author by means of not less than ?ve reviewers. The evaluation procedure concluded with a week internet dialogue procedure which led to 32 papers being chosen for presentation. regrettably, there have been a couple of solid papers that can now not be integrated within the software as a result of a scarcity of house. we want to thank all of the authors who submitted papers to CHES 2006. as well as ordinary displays, we have been very lucky to have within the programthreeexcellentinvitedtalksgivenbyKazumaroAoki(NTT)on“Integer Factoring using computer Cluster,” Ari Juels (RSA Labs) on “The Outer Limits of RFID protection” and Ahmad Sadeghi (Ruhr collage Bochum) on “Challenges for depended on Computing.” this system additionally integrated a rump consultation, chaired through Christof Paar, that includes casual shows on contemporary results.

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About the respective effectiveness of these countermeasures. Finally, we justify the need of combined metrics for the evaluation, comparison and understanding of side-channel attacks. 1 Introduction In [14], a formal practice-oriented model for the analysis of cryptographic primitives against side-channel attacks was introduced as a specialization of Micali and Reyzin’s “physically observable cryptography” paradigm [8]. The model is based on an theoretical framework in which the effect of practically relevant leakage functions is evaluated with a combination of security and information theoretic measurements.

The Stochastic Model’s strength is the ability to “learn” quickly from a small number of samples. One weakness lies in the reduced precision due to the linear approximation in a vector subspace. A second weakness is the usage of only a single covariance matrix. If the approximation of the data-dependent part is not precise enough, errors in the approximation affect the remaining “noise”. 5 Experimental Evaluation: Optimized Results The maximum efficiency achievable at key extraction for each method is of high importance, so that we carried out optimizations for each method.

Finally, we provide some experimental validations of our analysis and discuss the advantages of our combination of metrics with respect to other evaluation techniques. Importantly, in our theoretical framework, side-channel analysis can be viewed as a classification problem. Our results consequently tend to estimate the security limits of side-channel adversaries with two respects. First, because of our information theoretic approach, we aim to evaluate precisely the average amount of information that is available in some physical observations.

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