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Hier finden Sie wissenschaftliche Publikationen aus den FraunhoferInstituten. A new difference method for sidechannel analysis with highdimensional leakage models
 Dunkelman, O.: Topics in Cryptology  CTRSA 2012. The Cryptographers' Track at the RSA Conference : San Francisco, CA, USA, February 27  March 2, 2012. Proceedings Berlin: Springer, 2012 (Lecture Notes in Computer Science 7178) ISBN: 9783642279546 ISBN: 9783642279539 ISBN: 3642279538 ISSN: 03029743 pp.365382 
 Cryptographers' Track at the RSA Conference (CTRSA) <12, 2012, San Francisco/Calif.> 

 English 
 Conference Paper 
 Fraunhofer SIT () 
Abstract
The goal of the DPA contest v2 (2009  2010) was to find the most efficient sidechannel attack against a particular unprotected AES128 hardware implementation. In this paper we discuss two problems of general importance that affect the success rate of profiling based attacks, and we provide effective solutions. First, we consider the impact of temperature variations on the power consumption, which causes a socalled drifting offset. To cope with this problem we introduce a new method called Offset Tolerant Method (OTM) and adjust OTM to the stochastic approach (SAOTM). The second important issue of this paper concerns the choice of an appropriate leakage model as this determines the success rate of SA and SAOTM. Experiments with highdimensional leakage models show that the overall leakage is not only caused by independent transitions of bit lines. Compared to the formely best submitted attack of the DPA contest v2 the combination of SAOTM with highdimensional lea kage models reduces the required number of power traces to 50%.