Paper 2022/1054

SIDH with masked torsion point images

Tako Boris Fouotsa, École Polytechnique Fédérale de Lausanne
Abstract

We propose a countermeasure to the Castryck-Decru attack on SIDH. The attack heavily relies on the images of torsion points. The main input to our countermeasure consists in masking the torsion point images in SIDH in a way they are not exploitable in the attack, but can be used to complete the key exchange. This comes with a change in the form the field characteristic and a considerable increase in the parameter sizes.

Metadata
Available format(s)
PDF
Category
Public-key cryptography
Publication info
Preprint.
Keywords
Post-quantum cryptography supersingular isogenies SIDH SIKE torsion point attacks
Contact author(s)
tako fouotsa @ epfl ch
History
2022-08-17: approved
2022-08-15: received
See all versions
Short URL
https://ia.cr/2022/1054
License
Creative Commons Attribution
CC BY

BibTeX

@misc{cryptoeprint:2022/1054,
      author = {Tako Boris Fouotsa},
      title = {SIDH with masked torsion point images},
      howpublished = {Cryptology ePrint Archive, Paper 2022/1054},
      year = {2022},
      note = {\url{https://eprint.iacr.org/2022/1054}},
      url = {https://eprint.iacr.org/2022/1054}
}
Note: In order to protect the privacy of readers, eprint.iacr.org does not use cookies or embedded third party content.