Bio

I am currently a PhD student at Radboud University Nijmegen, in the Digital Security Group in iCIS, under the supervision of Bart Mennink (advisor) and Joan Daemen (promotor). Before that, I did my Master Thesis at PQShield in Paris under the supervision of Raphaël del Pino and Thomas Prest.

My research focuses on symmetric cryptography including all aspects of cryptology and formal verification. Nevertheless, I am interested in all areas of cryptology, and generally, in privacy enhancing technology.

Updates

• Starting internship at NTU under Mustafa Khairallah, from 1st July.
• I joined the candidate board for my chess club as a general board member (Algemeen Bestuurslid) : SSVN Tussen de Torens.

Research

Pre-Prints

• MacaKey: Full-State Keyed Sponge Meets the Summation-Truncation Hybrid To Pad or Not to Pad? Padding-Free Arithmetization-Oriented Sponges
  Charlotte Lefevre, Mario Marhuenda Beltrán
  [eprint]

Publications

• To Pad or Not to Pad? Padding-Free Arithmetization-Oriented Sponges
  Charlotte Lefevre, Mario Marhuenda Beltrán, Bart Mennink
  IACR Trans. Symmetric Cryptol. 2025(1): 97-137 (2025)
  [paper] [video]
• Generic Security of the SAFE API and Its Applications
  Dmitry Khovratovich, Mario Marhuenda Beltrán, Bart Mennink
  
  ASIACRYPT (8) 2023: 301-327
  [paper] [video]

Activities

Talks and Presentations

• Crypto Working Group
• AsiaCrypt 2023
• Lunch Talk iCis
• End of Escada
• FSE 2025

Teaching

• Applied Cryptography 2025-2024
• Applied Cryptography 2023-2024
• Applied Cryptography 2022-2023

Editorial Service

External reviewer for:

ASIACRYPT 2024-25	EUROCRYPT 2024-25
CRYPTO 2025	CIC

Contact

• mmarhuenda (at) cs.ru.nl
• PGP key, EA9B AC8C AE4B 39A4 BF78 DABE C382 7A6D 5D9B CE88

Postal Address

• Radboud University, FNWI-iCIS/DiS
• P.O. Box 9010
• 6500 GL Nijmegen, The Netherlands