Jan Schoone

"Sinds we god, religie en zingeving hebben afgeschaft, staan we als kwetsbare mechaniekjes in de wereld. We zijn gereduceerd tot onze biologie. We offeren het volle leven op om het vege lijf te redden, omdat het vege lijf het enige is dat ons nog kenmerkt."
              - Ilja Leonard Pfeijffer, [nrc: April 14, 2020]

Theorem: There are only finitely many useful numbers.

As of October 2018 I am working as a PhD-student in the Digital Security group at the iCIS institute of the Radboud University. The research is conducted under the supervision of prof. dr. Joan Daemen and part of the ESCADA project.
I am researching algebraic attacks on cryptosystems and investigating properties of maps with cryptographic importance.

In the past, my research interests have been finite rings, polynomial mappings and Mathieu-Zhao spaces. On these subjects I have written my Bachelor's and Master's thesis at Radboud University under supervision of dr. Arno van den Essen.

Works Council:

Since being elected as a member of the Works Council in september 2019, I have been secretary of the Works Council from 2019 to 2021 and again from 2023 to now.

Publications:

[yy/mm/dd]: "Title" [file-type with hyperlink] "Journal/conference/misc"

[24/01/17]: The state diagram of chi [pdf] Designs, Codes and Cryptography
[23/11/03]: Algebraic properties of the maps chi_n [pdf] Cryptology ePrint Archive (Preprint)
[23/05/17]: Kernels of linear maps: A generalization of Duistermaat and Van der Kallens theorem [pdf] arXiv (Preprint)
[23/03/06]: The state diagram of chi [pdf] Cryptology ePrint Archive (Preprint)
[20/05/07]: Algebraic and Higher-Order Differential Cryptanalysis of Pyjamask-96 [pdf] Transactions on Symmetric Cryptology
[18/08/28]: Around the Jacobian Conjecture [pdf] Master's Thesis

Teaching:

As Lecturer (2021-2022):

Fall 2021: Calculus, for premaster and HBO-minor students
Spring 2022: Calculus and Probability Theory, for first year Computing Science students

As Teaching Assistant (2018-2022):

Spring 2019/2020/2021 and Fall 2021: Introduction to Cryptography, for second year Computing Science students

As Student Assistant (2009-2018):

Commutative Algebra, for Mathematics master students
Famous Problems in Mathematics, for first year Mathematics students
Group Theory 2, for first year Mathematics students
Introduction to Graph Theory, for first year Mathematics students
Mathematics 2 for Artificial Intelligence, for second year Artificial Intelligence students
New Number Systems, for second year students of the Faculty of Science (excluding Mathematics students)
Rings and Fields, for second year Mathematics students
Forensic Statistics, for high school students
Fractals, for high school students
Knot Theory, for high school students
Quaternions, for high school students and teachers
Set Theory, for high school students
LaTeX: crash course, for second year Mathematics students

Presentations:

[yy/mm/dd]: "Title" [file-type with hyperlink] at "Venue"

[24/02/09]: Univariate representations of chi [pdf] at ESCADA-meeting
[23/07/13]: Is chi_n a power function? [pdf] at SIAM Conference on Applied Algebraic Geometry (AG23) (Eindhoven University of Technology)
[22/09/26]: The state diagram of chi [pdf] at FrisiaCrypt 2022
[21/10/15]: Black holes in algebra: My introduction to Mathius-Zhao spaces and research [pdf] at ESCADA-meeting
[21/02/10]: Order of odd-period chi [pdf] at ESCADA-meeting
[20/11/12]: Algebraic and Higher-Order Differential Cryptanalysis of Pyjamask-96 [pdf] at FSE 2020 (5-minute introductory presentation)
[20/11/05]: Algebraic and Higher-Order Differential Cryptanalysis of Pyjamask-96 [pdf] at FSE 2020 online
[20/10/28]: Algebraic and Higher-Order Differential Cryptanalysis of Pyjamask-96 at ESCADA-meeting
[20/09/10]: Bijective properties of chi [pdf] at ESCADA-meeting
[20/03/25]: Cyclic properties of even-period chi [pdf] at ESCADA-meeting
[20/02/28]: Algebraic and Higher-Order Differential Cryptanalysis of Pyjamask-96 [pdf] at Digital Security Lunch Colloquium
[19/11/28]: Some algebraic views on chi [pdf] at ESCADA-meeting
[19/03/01]: On the division property [pdf] at Radboud Crypto Reading Group
[18/08/30]: Mathieu-Zhao spaces of finite rings [pdf] (Master's Thesis presentation)

Contact Info:

Miscellaneous:

A poem told by Roy Bailey in a live performance with Chumbawamba: [SimpleSimon]