Abstract
In this article we discuss different types of template attacks on masked implementations. All template attacks that we describe are applied in practice to a masked AES software implementation on an 8-bit microcontroller. They all break this implementation. However, they all require quite a different number of traces. It turns out that a template-based DPA attack leads to the best results. In fact, a template-based DPA attack is the most natural way to apply a template attack to a masked implementation. It can recover the key from about 15 traces. All other attacks that we present perform worse. They require between about 30 and 1800 traces. There is no difference between the application of a template-based DPA attack to an unmasked and to a masked implementation. Hence, we conclude that in the scenario of template attacks, masking does not improve the security of an implementation.
The work described in this paper has been supported in part by the European Commission through the IST Programme under Contract IST-2002-507932 ECRYPT and through the Austrian Science Fund (FWF) under grant number P18321.
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Oswald, E., Mangard, S. (2006). Template Attacks on Masking—Resistance Is Futile. In: Abe, M. (eds) Topics in Cryptology – CT-RSA 2007. CT-RSA 2007. Lecture Notes in Computer Science, vol 4377. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11967668_16
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DOI: https://doi.org/10.1007/11967668_16
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