Jana SotákováI am a PhD student of Christian Schaffner, Serge Fehr and Peter Bruin at Institute for Logic, Language and Computation at the University of Amsterdam (ILLC) and a part of the QuSoft Crypto group. I started my PhD in 2019 and expect to graduate in December 2023.
From December 2022 until March 2023, I will be on doing an internship with Kristin Lauter at Facebook AI Research.
I am working on:
- post-quantum cryptography, especially isogeny-based cryptography,
- computational number theory,
- quantum algorithms used for cryptanalysis.
- From December 2022 until March 2023, I will be an intern for Kristin Lauter at Facebook AI Research.
We finished our paper Disorientation faults in CSIDH, available as
Joint work with
Gustavo Banegas, Juliane Krämer, Tanja Lange, Michael Meyer,
Lorenz Panny, Krijn Reijnders, and Monika Trimoska.
Summary: While this is a physical attack (specifically, a fault-injection attack), we do exploit a lot of the inherent structure present in computing isogenies. Specifically, our threat model assumes we can flip the direction of some isogeny steps during the class group action computation. We overexamine what information this leaks - and we show that in almost all implementations, one can recover the whole secret key from a very modest number of successful faults!
- I attended the Leuven Isogeny Days 3 workshop.
I made a
for ANTS XV presenting our new fault attack on CSIDH-like group action.
Here are the two separate pictures for the neighbourhood graphs
and here is the full graph.
We will put the paper online shortly!The paper.
I am attending the
PCMI 2022 Summer Session,
as a Teaching Assistant for the course on isogenies given by Kristin Lauter in the second week of the Graduate Summer School!
Course materials (very similar to the 2021 online version) will be available here.
On April 5, I gave a talk at the
ACCESS seminar talking about
CTIDH: constant time CSIDH.
You can check the
Here are some expository notes I wrote about CTIDH to go with my talk at the ACCESS seminar, focusing on the math ideas behind CTIDH.
For more (mostly older), see also
the news section.
PapersGoogle scholar, DBLP database entry, IACR database, ORCID.
- Disorientation faults in CSIDH
Gustavo Banegas, Juliane Krämer, Tanja Lange, Michael Meyer, Lorenz Panny, Krijn Reijnders, Jana Sotáková, Monika Trimoska
Available on eprint as Report 2022/1202.
My poster from ANTS is available here.
- CTIDH: Faster constant-time CSIDH
Gustavo Banegas, Daniel J. Bernstein, Fabio Campos, Tung Chou, Tanja Lange, Michael Meyer, Benjamin Smith, Jana Sotáková
Available on the website and eprint Report 2021/633.
Also available as video on Youtube, and a published paper.
Slides from my ACCESS talk. Slides from the CHES talk.
Explicit connections between supersingular isogeny graphs and Bruhat--Tits trees
Laia Amorós, Annamaria Iezzi, Kristin Lauter, Chloe Martindale, and Jana Sotáková
To appear in WIN-E 3 proceedings.
Available on eprint and here.
Breaking the decisional Diffie-Hellman problem for class group actions using genus theory
Wouter Castryck and Jana Sotáková and Frederik Vercauteren
Crypto 2020, published paper, Best Paper Award
preprint available on eprint.
- Adventures in Supersingularland
joint work with Sarah Arpin, Catalina Camacho-Navarro, Kristin Lauter, Joelle Lim, Kristina Nelson and Travis Scholl
Experimental Mathematics, available in Open Access at https://doi.org/10.1080/10586458.2021.1926009.
preprint available at eprint or at arXiv.
Eta quotients and class fields of imaginary quadratic fields
masters thesis under the supervision of Marco Streng (Leiden, 2017) available here
Where to find me on the WebMy QuSoft profile . My ILLC website. My CWI website. My LinkedIn. Google scholar page. DBLP database entry. IACR database entry. My ORCID ID.
My old website that contains some notes I've written.
An accurate log of my athletics endeavours can be found here. I even have an Olympic.org site! I attended the Youth Olympic Games in 2010: Wikipediaeven has an entry about my race.
My Alma Mater profile.
My blog. If my blog interests you, please send me a message. I will start blogging again.