Universitätsstr. 140
Ruhr-University Bochum
44801 Bochum
Germany
Room: MC 0.29
Tel: +49 (0)234 32-23261
E-Mail: alex.lastname@rub.de
Office hours: By Arrangement
Table of Contents
Publications
Alexander Karenin and Elena Kirshanova and Julian Nowakowski, Alexander May
Fast Slicer for Batch-CVP: Making Lattice Hybrid Attacks Practical Proceedings Article
In: Advances in Cryptology (ASIACRYPT 25), 2025.
Links | Schlagwörter: Crypto Flagship, Rank A*/A
@inproceedings{nokey,
title = {Fast Slicer for Batch-CVP: Making Lattice Hybrid Attacks Practical},
author = {Alexander Karenin and
Elena Kirshanova and
Julian Nowakowski and
Alexander May
},
url = {https://eprint.iacr.org/2025/1910.pdf, Paper},
year = {2025},
date = {2025-12-02},
urldate = {2025-12-02},
booktitle = {Advances in Cryptology (ASIACRYPT 25)},
journal = {Advances in Cryptology (ASIACRYPT 25)},
keywords = {Crypto Flagship, Rank A*/A},
pubstate = {published},
tppubtype = {inproceedings}
}
Simon Damm, Asja Fischer, Alexander May, Soundes Marzougui, Leander Schwarz, Henning Seidler, Jean-Pierre Seifert, Jonas Thietke, Vincent Quentin Ulitzsch
Solving Concealed ILWE and its Application for Breaking Masked Dilithium Proceedings Article
In: Advances in Cryptology (ASIACRYPT 25), 2025.
Links | Schlagwörter: Crypto Flagship, Rank A*/A
@inproceedings{nokey,
title = {Solving Concealed ILWE and its Application for Breaking Masked Dilithium},
author = {Simon Damm and Asja Fischer and Alexander May and Soundes Marzougui and Leander Schwarz and Henning Seidler and Jean-Pierre Seifert and Jonas Thietke and Vincent Quentin Ulitzsch},
url = {https://eprint.iacr.org/2025/1629.pdf, Paper},
year = {2025},
date = {2025-12-01},
urldate = {2025-12-01},
booktitle = {Advances in Cryptology (ASIACRYPT 25)},
keywords = {Crypto Flagship, Rank A*/A},
pubstate = {published},
tppubtype = {inproceedings}
}
Alexander May, Massimo Ostuzzi, Henrik Ressler
Just Guess: Improved (Quantum) Algorithm for the Underdetermined MQ Problem Artikel Geplante Veröffentlichung
In: Geplante Veröffentlichung.
@article{nokey,
title = {Just Guess: Improved (Quantum) Algorithm for the Underdetermined MQ Problem},
author = {Alexander May and Massimo Ostuzzi and Henrik Ressler},
url = {https://eprint.iacr.org/2025/1788.pdf, Paper},
year = {2025},
date = {2025-10-01},
urldate = {2025-10-01},
keywords = {Quantum},
pubstate = {forthcoming},
tppubtype = {article}
}
Timo Glaser, Alexander May, Julian Nowakowski
Super-Quadratic Quantum Speed-Ups and Guessing Many Likely Keys Artikel Geplante Veröffentlichung
In: Preprint, Geplante Veröffentlichung.
@article{nokey,
title = {Super-Quadratic Quantum Speed-Ups and Guessing Many Likely Keys},
author = {Timo Glaser and Alexander May and Julian Nowakowski},
url = {https://eprint.iacr.org/2023/797.pdf, Paper},
year = {2025},
date = {2025-06-01},
urldate = {2025-06-01},
journal = {Preprint},
keywords = {Quantum},
pubstate = {forthcoming},
tppubtype = {article}
}
Alexander May, Massimo Ostuzzi
Multiple Group Action Dlogs with(out) Precomputation Proceedings Article
In: Public Key Cryptography (PKC '25), 2025.
Links | Schlagwörter: Crypto Area
@inproceedings{DBLP:journals/iacr/MayO24,
title = {Multiple Group Action Dlogs with(out) Precomputation},
author = {Alexander May and Massimo Ostuzzi},
url = {https://eprint.iacr.org/2024/564, Paper
https://iacr.org/submit/files/slides/2025/pkc/pkc2025/5/5_slides.pdf, Slides
https://doi.org/10.1007/978-3-031-91826-1_12, DOI},
year = {2025},
date = {2025-05-01},
urldate = {2025-05-01},
booktitle = {Public Key Cryptography (PKC '25)},
journal = {Public Key Cryptography (PKC '25)},
keywords = {Crypto Area},
pubstate = {published},
tppubtype = {inproceedings}
}
Simon Damm, Nicolai Kraus, Alexander May, Julian Nowakowski, Jonas Thietke
One Bit to Rule Them All - Imperfect Randomness Harms Lattice Signatures Proceedings Article
In: Public Key Cryptography (PKC '25), 2025.
Links | Schlagwörter: Crypto Area
@inproceedings{nokey,
title = {One Bit to Rule Them All - Imperfect Randomness Harms Lattice Signatures},
author = {Simon Damm and Nicolai Kraus and Alexander May and Julian Nowakowski and Jonas Thietke},
url = {https://eprint.iacr.org/2025/820.pdf, Paper
https://iacr.org/submit/files/slides/2025/pkc/pkc2025/144/144_slides.pdf, Slides
https://link.springer.com/chapter/10.1007/978-3-031-91820-9_10, DOI},
year = {2025},
date = {2025-05-01},
urldate = {2025-05-01},
booktitle = {Public Key Cryptography (PKC '25)},
keywords = {Crypto Area},
pubstate = {published},
tppubtype = {inproceedings}
}
Marcus Brinkmann, Chitchanok Chuengsatiansup, Alexander May, Julian Nowakowski, Yuval Yarom
Leaky McEliece: Secret Key Recovery From Highly Erroneous Side-Channel Information Artikel
In: Transactions on Cryptographic Hardware and Embedded Systems (TCHES), 2025.
Links | Schlagwörter: Crypto Area, Rank A*/A
@article{DBLP:journals/tches/BrinkmannCMNY25b,
title = {Leaky McEliece: Secret Key Recovery From Highly Erroneous Side-Channel Information},
author = {Marcus Brinkmann and Chitchanok Chuengsatiansup and Alexander May and Julian Nowakowski and Yuval Yarom},
url = {https://eprint.iacr.org/2023/1536.pdf, Paper},
year = {2025},
date = {2025-02-11},
urldate = {2025-02-11},
journal = {Transactions on Cryptographic Hardware and Embedded Systems (TCHES)},
keywords = {Crypto Area, Rank A*/A},
pubstate = {published},
tppubtype = {article}
}
Sebastian Bitzer, Jeroen Delvaux, Elena Kirshanova, Sebastian Maaßen, Alexander May, Antonia Wachter-Zeh
How to Lose Some Weight - A Practical Template Syndrome Decoding Attack Proceedings Article
In: Coding and Cryptography (WCC 24) and Design, Codes and Cryptography (2025), 2024.
Links | Schlagwörter: Crypto Others
@inproceedings{DBLP:journals/iacr/BitzerDKMMW24,
title = {How to Lose Some Weight - A Practical Template Syndrome Decoding Attack},
author = {Sebastian Bitzer and Jeroen Delvaux and Elena Kirshanova and Sebastian Maaßen and Alexander May and Antonia Wachter-Zeh},
url = {https://eprint.iacr.org/2024/621, Paper
https://wcc2024.sites.dmi.unipg.it/SLIDES/Bitzer.pdf, Slides
https://doi.org/10.1007/s10623-025-01603-1, DOI},
year = {2024},
date = {2024-01-01},
urldate = {2024-01-01},
booktitle = {Coding and Cryptography (WCC 24) and Design, Codes and Cryptography (2025)},
journal = {IACR Cryptol. ePrint Arch.},
keywords = {Crypto Others},
pubstate = {published},
tppubtype = {inproceedings}
}
Alexander May, Julian Nowakowski
Too Many Hints - When LLL Breaks LWE Proceedings Article
In: Advances in Cryptology (ASIACRYPT 23), 2023.
Links | Schlagwörter: Crypto Flagship, Rank A*/A
@inproceedings{DBLP:conf/asiacrypt/MayN23,
title = {Too Many Hints - When LLL Breaks LWE},
author = {Alexander May and Julian Nowakowski},
url = {https://eprint.iacr.org/2023/777.pdf, Paper
https://iacr.org/submit/files/slides/2023/asiacrypt/asiacrypt2023/314/slides.pdf, Slides
https://www.youtube.com/watch?v=4USR_wlFpg8, Video
https://doi.org/10.1007/978-981-99-8730-6\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\_4, DOI
},
year = {2023},
date = {2023-12-01},
urldate = {2023-12-01},
booktitle = {Advances in Cryptology (ASIACRYPT 23)},
volume = {14441},
series = {Lecture Notes in Computer Science},
keywords = {Crypto Flagship, Rank A*/A},
pubstate = {published},
tppubtype = {inproceedings}
}
Timo Glaser, Alexander May
How to Enumerate LWE Keys as Narrow as in Kyber/Dilithium Proceedings Article
In: Cryptology and Network Security (CANS 23), S. 75–100, Springer, 2023.
Links | Schlagwörter: Crypto Others
@inproceedings{DBLP:conf/cans/GlaserM23,
title = {How to Enumerate LWE Keys as Narrow as in Kyber/Dilithium},
author = {Timo Glaser and Alexander May},
url = {https://eprint.iacr.org/2022/1337.pdf, Paper
https://doi.org/10.1007/978-981-99-7563-1_4, DOI
https://dblp.uni-trier.de/rec/conf/cans/GlaserM23.html?view=bibtex, bibtex},
year = {2023},
date = {2023-01-01},
urldate = {2023-01-01},
booktitle = {Cryptology and Network Security (CANS 23)},
volume = {14342},
pages = {75–100},
publisher = {Springer},
series = {Lecture Notes in Computer Science},
keywords = {Crypto Others},
pubstate = {published},
tppubtype = {inproceedings}
}
Lectures (Moodle/Notes)
- Cryptanalysis (Codes, Classic 1, Cl. 2)
- Cryptography (Recent, Slides Sym, Slides Asym)
- Probabilistic (Basic, Algos)
- Quantum Algorithms (Script)
Crypto Challenges
- Bochum Challenges (for experts)
- Mystery Twister (for everybody)
Former PhDs
Show names, year of graduation
- Carl Richard Theodor Schneider, 2024
- Önder Askin, 2024
- Floyd Zweydinger, 2023
- Lars Schlieper, 2022
- Alexander Helm, 2020
- Andre Esser, 2020
- Matthias Minihold, 2019
- Leif Both, 2018
- Robert Kübler, 2018
- Elena Kirshanova, 2016
- Ilya Ozerov, 2016
- Gottfried Herold, 2014
- Alexander Meurer, 2014
- Mathias Herrmann, 2011
- Maike Ritzenhofen, 2010
Calvin & Hobbes