International Association for Cryptologic Research

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AprèsSQI: Extra Fast Verification for SQIsign Using Extension-Field Signing

Authors:
Maria Corte-Real Santos , University College London
Jonathan Komada Eriksen , NTNU
Michael Meyer , University of Regensburg
Krijn Reijnders , Radboud University Nijmegen
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Conference: EUROCRYPT 2024
Abstract: We optimise the verification of the SQIsign signature scheme. By using field extensions in the signing procedure, we are able to significantly increase the amount of available rational 2-power torsion in verification, which achieves a significant speed-up. This, moreover, allows several other speed-ups on the level of curve arithmetic. We show that the synergy between these high-level and low-level improvements gives significant improvements, making verification 2.07 times faster, or up to 3.41 times when using size-speed trade-offs, compared to the state of the art, without majorly degrading the performance of signing.
BibTeX
@inproceedings{eurocrypt-2024-33931,
  title={AprèsSQI: Extra Fast Verification for SQIsign Using Extension-Field Signing},
  publisher={Springer-Verlag},
  author={Maria Corte-Real Santos and Jonathan Komada Eriksen and Michael Meyer and Krijn Reijnders},
  year=2024
}