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- W3091367000 abstract "Higher-order masking countermeasures provide strong provable security against side-channel attacks at the cost of incurring significant overheads, which largely hinders its applicability. Previous works towards remedying cost mostly concentrated on “local” calculations, i.e., optimizing the cost of computation units such as a single AND gate or a field multiplication. This paper explores a complementary “global” approach, i.e., considering multiple operations in the masked domain as a batch and reducing randomness and computational cost via amortization. In particular, we focus on the amortization of $$ell $$ parallel field multiplications for appropriate integer $$ell > 1$$ , and design a kit named packed multiplication for implementing such a batch. For $$ell +dle 2^m$$ , when $$ell $$ parallel multiplications over $$mathbb {F}_{2^{m}}$$ with d-th order probing security are implemented, packed multiplication consumes $$d^2+2ell d + ell $$ bilinear multiplications and $$2d^2 + d(d+1)/2$$ random field variables, outperforming the state-of-the-art results with $$O(ell d^2)$$ multiplications and $$ell leftlfloor d^2/4rightrfloor + ell d$$ randomness. To prove d-probing security for packed multiplications, we introduce some weaker security notions for multiple-inputs-multiple-outputs gadgets and use them as intermediate steps, which may be of independent interest. As parallel field multiplications exist almost everywhere in symmetric cryptography, lifting optimizations from “local” to “global” substantially enlarges the space of improvements. To demonstrate, we showcase the method on the AES Subbytes step, GCM and TET (a popular disk encryption). Notably, when $$d=8$$ , our implementation of AES Subbytes in ARM Cortex M architecture achieves a gain of up to $$33%$$ in total speeds and saves up to $$68%$$ random bits than the state-of-the-art bitsliced implementation reported at ASIACRYPT 2018." @default.
- W3091367000 created "2020-10-08" @default.
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- W3091367000 date "2020-01-01" @default.
- W3091367000 modified "2023-10-17" @default.
- W3091367000 title "Packed Multiplication: How to Amortize the Cost of Side-Channel Masking?" @default.
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- W3091367000 doi "https://doi.org/10.1007/978-3-030-64837-4_28" @default.
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