2nd-order t-test results Clause Samples

2nd-order t-test results. The rejec- tion of Hnull indicates potential leakage. The test value slightly exceeds the threshold, indicating potential leakage. Thus, it hints the experimental verification of the order-detection theorem in our ARM-based device for 2nd-order ISW schemes. However, several concerns were raised over the t-test robustness, usually w.r.t. the exact threshold value (Appendix A from [2, 22]). As a result, it remains an open question whether 2nd-order leakages are practically exploitable in our context. To investigate this, we perform a 2nd-order CPA-based attack using the centered product combi- nation function and the custom bitsliced selection function on the 1st round of PRESENT. The point selection window has size 100 samples and we use 100 k traces. The results are visible in Fig. 7 and show that the leakage is exploitable with roughly 60 k traces. Moreover, we need to stress the fact that this type of behavior has been observed in a specific ARM-based device. Although it provides indications on the behavior of similar architectures, this experimental result should not be extrapolated as a hard fact w.r.t. all ARM Cortex-M devices. Naturally, a 3rd- order multivariate t-test is able to detect a large amount of leakage, as shown in Fig. 8 and indicates that a 3rd-order attack is also applicable.
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