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## Seminars given

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***October 25, 2011* - Tolerant Algebraic Side-Channel Analysis of AES

by Yossi Oren

Abstract: | Classical power analysis attacks are difficult to mount when only a single power trace is available: the statistical methods that make DPA attacks so successful are not applicable since they require many (typically thousands) of traces. Recently it was suggested by Standaert et al. to use algebraic methods for the single-trace scenario, converting the key recovery problem into a Boolean satisfiability (SAT) problem, then using a SAT solver. However, this approach is extremely sensitive to noise (allowing an error rate of well under 1% at most), and the question of its practicality remained open.
In this work we show how a single-trace side-channel analysis problem can be transformed into a pseudo-Boolean optimization (PBOPT) problem, which takes errors into consideration. We call our new attack methodology Tolerant Algebraic Side-Channel Analysis (TASCA). We will describe the new methodology, its strengths and limitations, and finally show a full TASCA-based key-recovery attack on a microcontroller-based implementation of the Advanced Encryption Standard. |