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### M.Sc.HugoSauerbier Couvée

Technical University of Munich

Associate Professorship of Coding and Cryptography (Prof. Wachter-Zeh)

Postal:
Theresienstr. 90
80333 München

I am currently a PhD candidate researcher in mathematics at the Technical University of Munich in the Coding and Cryptography group under supervision of Prof. Antonia Wachter-Zeh.

My research interest lies in many topics connected to Algebraic Coding Theory,  included (but not limited to):  coding theory for various metrics, code-based cryptography, combinatorics, algebra, finite geometry.

## Coding theory in different metrics

#### Description

In this thesis, the student will study the mathematics of codes in diffent metrics such as the Hamming metric, (sum-)rank metric, column/row-cover metric, etc.

The focus can lie on similar mathematical ideas shared across different metrics, such as bounds on codes, good code constructions, decoding algorithms, applications.

## Code-based Cryptography

#### Description

In this thesis, the student will study the mathematics of linear codes and how they can be used to design cryptosystems.

## Rank-Metric Codes and Their Applications

#### Description

Rank-matric codes are codes that live in a vector space that is endowed with a different metric than the Hamming metric: in the rank-metric the distance between two codewords, represented as matrices over a smaller field, is defined as the rank of their difference.

The theory of rank-metric codes has interesting connections to many topics in discrete mathematics and promissing applications to code-based cryptography and network coding.

In this seminar work, the student will study properties and constructions of rank-metric codes and one or more applications. The goal is to understand and summarize parts of the following papers:

[1] H. Bartz, L. Holzbaur, H. Liu, S. Puchinger, J. Renner, A. Wachter-Zeh (2022). “Rank-Metric Codes and Their Applications”. arXiv: 2203.12384  https://arxiv.org/pdf/2203.12384.pdf

[2] K. Marshall, (2016). “A study of cryptographic systems based on Rank metric codes”, Dissertation, University of Zurich  https://www.zora.uzh.ch/id/eprint/127105/1/Diss%20Kyle.pdf

[3] T. Randrianarisoa, (2018). “Rank metric codes, codes using linear complexity and applications to public key cryptosystems”, Dissertation, University of Zurich  https://www.zora.uzh.ch/id/eprint/153545/1/153545.pdf

[4] E. Gorla (2019). “Rank-metric codes”. arXiv: 1902.02650  https://arxiv.org/pdf/1902.02650.pdf

[5] E. Gorla and A. Ravagnani. (2018). “Codes endowed with the rank metric”. In: Network Coding and Subspace Designs. Springer. 3–23.  https://link.springer.com/content/pdf/10.1007/978-3-319-70293-3.pdf

## A Summary of the Most Recent Code-Based Digital Signature Schemes based on Variations of the Syndrome Decoding Problem

#### Description

In this thesis, the student will study and summarize the most recent code-based digital signature schemes based on the syndrome decoding problem