Paper 2022/847
A note on key control in CSIDH
Abstract
In this short note we explore a particular behaviour of the CSIDH key exchange that leads to a very special form of (shared) key control via the use of the quadratic twists. This peculiarity contained in CSIDH with regard to quadratic twists was already noted in the original CSDIH work and used in several subsequent papers but we believe spelling out this in the form of an attack might be useful to the wider community.
Metadata
- Available format(s)
-
PDF
- Category
- Public-key cryptography
- Publication info
- Preprint.
- Keywords
- CSIDH key exchange isogeny
- Contact author(s)
- antonio sanso @ gmail com
- History
- 2022-08-01: last of 2 revisions
- 2022-06-27: received
- See all versions
- Short URL
- https://ia.cr/2022/847
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2022/847, author = {Antonio Sanso}, title = {A note on key control in {CSIDH}}, howpublished = {Cryptology {ePrint} Archive, Paper 2022/847}, year = {2022}, url = {https://eprint.iacr.org/2022/847} }