Abstract
This works studies the use of the AES block-cipher for Picnic-style signatures, which work in the multiparty-computation-in-the-head model. It applies advancements to arithmetic circuits for the computation of the AES S-box over multiparty computation in the preprocessing model to obtain an improvement of signature sizes of 40% on average compared to using binary circuits for AES-128, AES-192 and AES-256 in combination with previous techniques. This work also discusses other methods for the computation of the S-box and provides insights into the reaches and limits of the multiparty-computation-in-the-head paradigm.
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Acknowledgments
The authors would like to thank the referees for a number of comments which improved the quality of the paper. This work has been supported in part by ERC Advanced Grant ERC-2015-AdG-IMPaCT, by the Defense Advanced Research Projects Agency (DARPA) and Space and Naval Warfare Systems Center, Pacific (SSC Pacific) under contract No. N66001-15-C-4070, and by the Fund for Scientific Research Flanders (FWO) under an Odysseus project GOH9718N. Lauren De Meyer is funded by a PhD fellowship of the FWO. Any opinions, findings and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the ERC, United States Air Force, DARPA or FWO.
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de Saint Guilhem, C.D., De Meyer, L., Orsini, E., Smart, N.P. (2020). BBQ: Using AES in Picnic Signatures. In: Paterson, K., Stebila, D. (eds) Selected Areas in Cryptography – SAC 2019. SAC 2019. Lecture Notes in Computer Science(), vol 11959. Springer, Cham. https://doi.org/10.1007/978-3-030-38471-5_27
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