## Cryptology ePrint Archive: Report 2015/837

Multi-Variate High-Order Attacks of Shuffled Tables Recomputation

Nicolas BRUNEAU and Sylvain GUILLEY and Zakaria NAJM and Yannick TEGLIA

Abstract: Masking schemes based on tables recomputation are classical countermeasures against high-order side-channel attacks. Still, they are known to be attackable at order $d$ in the case the masking involves $d$ shares. In this work, we mathematically show that an attack of order strictly greater than $d$ can be more successful than an attack at order $d$. To do so, we leverage the idea presented by Tunstall, Whitnall and Oswald at FSE 2013: we exhibit attacks which exploit the multiple leakages linked to one mask during the recomputation of tables. Specifically, regarding first-order table recomputation, improved by a shuffled execution, we show that there is a window of opportunity, in terms of noise variance, where a novel highly multivariate third-order attack is more efficient than a classical bivariate second-order attack. Moreover, we show on the example of the high-order secure table computation presented by Coron at EUROCRYPT 2014 that the window of opportunity enlarges linearly with the security order $d$.

Category / Keywords: implementation /

Original Publication (with minor differences): IACR-CHES-2015
DOI:
10.1007/978-3-662-48324-4_24

Date: received 28 Aug 2015

Contact author: sylvain guilley at telecom-paristech fr

Available format(s): PDF | BibTeX Citation

Note: Like in the CHES '15 paper, but where Alg. 1 and Fig. 1 have been made compatible.

Short URL: ia.cr/2015/837

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