Simon-Philipp Merz

About me

I am currently a PhD student in the Information Security Group at Royal Holloway, University of London. My supervisors are Simon Blackburn and Christophe Petit.

My doctoral research revolves around post-quantum cryptography and cryptanalysis with a special focus on isogeny-based cryptography. More generally, I am interested in computational number theory and various applications of pure mathematics to cryptography.

Before joining Royal Holloway, I obtained a BSc in Mathematics from the Free University of Berlin, an MSc in Pure Mathematics from Imperial College London and an MSc in Mathematics and Foundations of Computer Science from the University of Oxford.



Publications

  • On the Isogeny Problem with Torsion Point Information,
  • B. Fouotsa Tako, P. Kutas, S.-P. Merz,
    ePrint 2021/153.
  • Cryptanalysis of an oblivious PRF from supersingular isogenies,
  • A. Basso, P. Kutas, S.-P. Merz, C. Petit, A. Sanso,
    ASIACRYPT 2021, ePrint 2021/706.
  • One-way functions and malleability oracles:
    Hidden shift attacks on isogeny-based protocols
    ,
  • P. Kutas, S.-P. Merz, C. Petit, C. Weitkämper,
    EUROCRYPT 2021, ePrint 2021/282.
  • On Index Calculus Algorithms for Subfield Curves,
  • S.D. Galbraith, R. Granger, S.-P. Merz, C. Petit,
    SAC 2020, ePrint 2020/1315.
  • On Adaptive Attacks against Jao-Urbanik's Isogeny-Based Protocol,
  • A. Basso, P. Kutas, S.-P. Merz, C. Petit, C. Weitkämper,
    AFRICACRYPT 2020, ePrint 2020/244.
  • Another look at some isogeny hardness assumptions,
  • S.-P. Merz, R. Minko, C. Petit,
    CT-RSA 2020, ePrint 2019/950.
  • Factoring Products of Braids via Garside Normal Form,
  • S.-P. Merz, C. Petit,
    PKC 2019, ePrint 2018/1142.


Talks

  • EUROCRYPT 2021, Zagreb (HRV), 18 October 2021.
  • Presentation of the paper One-way functions and malleability oracles: Hidden shift attacks on isogeny-based protocols, slides.
  • SAC 2020, Halifax, Nova Scotia (virtual), 23 October 2020.
  • Presentation of the paper On Index Calculus Algorithms for Subfield Curves, slides.
  • CT-RSA 2020, San Francisco (USA), 27 February 2020.
  • Presentation of the paper Another look at some isogeny hardness assumptions, slides.
  • ISF World Congress 2019, Dublin (IRL), 26 October 2019.
  • Invited talk on mathematical problems underlying elliptic curve and isogeny-based cryptography.
  • PKC 2019, Beijing (CHN), 16 April 2019.
  • Presentation of the paper Factoring Products of Braids via Garside Normal Form, slides.


Teaching and Refereeing

During the winter semester 2015-2016, I was a teaching assistant for the course Computational Mathematics and Scientific Computing.

For the following conferences I was a (sub)reviewer:
CRYPTO 2019, SAC 2019, MathCrypt 2019, AFRICACRYPT 2019, IMACC 2019, PKC 2020, ANTS 2020, AFRICACRYPT 2020, PKC 2021, PQCrypto 2021, ASIACRYPT 2021, SAC 2021, IMACC 2021, ANCS 2022

I have been a reviewer for the following journals:
Advances in Mathematics of Communications; IET Information Security; Designs, Codes and Cryptography