International Association for Cryptologic Research

International Association
for Cryptologic Research


Paper: Mitaka: A Simpler, Parallelizable, Maskable Variant of Falcon

Thomas Espitau , NTT Corporation
Pierre-Alain Fouque , Rennes Univ, Inria and IRISA
François Gérard , University of Luxembourg
Mélissa Rossi , ANSSI
Akira Takahashi , Aarhus University
Mehdi Tibouchi , NTT Corporation
Alexandre Wallet , Rennes Univ, Inria and IRISA
Yang Yu , Tsinghua University
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Presentation: Slides
Conference: EUROCRYPT 2022
Abstract: This work describes the Mitaka signature scheme: a new hash-and-sign signature scheme over NTRU lattices which can be seen as a variant of NIST finalist Falcon. It achieves comparable efficiency but is considerably simpler, online/offline, and easier to parallelize and protect against side-channels, thus offering significant advantages from an implementation standpoint. It is also much more versatile in terms of parameter selection. We obtain this signature scheme by replacing the FFO lattice Gaussian sampler in Falcon by the “hybrid” sampler of Ducas and Prest, for which we carry out a detailed and corrected security analysis. In principle, such a change can result in a substantial security loss, but we show that this loss can be largely mitigated using new techniques in key generation that allow us to construct much higher quality lattice trapdoors for the hybrid sampler relatively cheaply. This new approach can also be instantiated on a wide variety of base fields, in contrast with Falcon's restriction to power-of-two cyclotomics. We also introduce a new lattice Gaussian sampler with the same quality and efficiency, but which is moreover compatible with the integral matrix Gram root technique of Ducas et al., allowing us to avoid floating point arithmetic. This makes it possible to realize the same signature scheme as Mitaka efficiently on platforms with poor support for floating point numbers. Finally, we describe a provably secure masking of Mitaka. More precisely, we introduce novel gadgets that allow provable masking at any order at much lower cost than previous masking techniques for Gaussian sampling-based signature schemes, for cheap and dependable side-channel protection.
Video from EUROCRYPT 2022
  title={Mitaka: A Simpler, Parallelizable, Maskable Variant of Falcon},
  author={Thomas Espitau and Pierre-Alain Fouque and François Gérard and Mélissa Rossi and Akira Takahashi and Mehdi Tibouchi and Alexandre Wallet and Yang Yu},