# Professional information

Since January 2023, I am a PhD candidate at Université Jean Monnet Saint-Etienne, in the SESAM team, under the supervison of Vincent Grosso and Pierre-Louis Cayrel. I work in embedded cryptography, with a focus on side-channnel and fault attacks and secure implementations.

From 2021 to 2022, I was a cryptography engineer at CryptoExperts where I mainly worked on White-Box Cryptography. From 2019 to 2021, I completed my Master in Cryptology and Information Security (Cryptis program) at Université de Limoges.

In my free time, I enjoy tackling crypto CTF challenges on some platforms such as CryptoHack and NSUCRYPTO.

Curriculum vitae: [pdf]


# Publications

  • Correlation Power Analysis on Ascon with Multi-bit Selection Function
      Viet Sang Nguyen, Vincent Grosso, Pierre-Louis Cayrel
      International Conference on Security and Cryptography (SECRYPT) 2025
      [paper] [code]
  • Practical Persistent Fault Attacks on AES with Instruction Skip
      Viet Sang Nguyen, Vincent Grosso, Pierre-Louis Cayrel
      IACR Communications in Cryptography (CiC) 2025
      [paper] [code]
  • Practical Second-Order CPA Attack on Ascon with Proper Selection Function
      Viet Sang Nguyen, Vincent Grosso, Pierre-Louis Cayrel
      CASCADE 2025
      [paper] [code]
  • OBSCURE: Versalite Software Obfuscation from a Lightweight Secure Element
      Darius Mercadier, Viet Sang Nguyen, Matthieu Rivain, Aleksei Udovenko
      IACR Transactions of Cryptographic Hardware and Embedded Systems (CHES) 2024
      [paper] [code] [artifact]

    • # Talks / Posters

  • Practical Second-Order CPA Attacks on Ascon with Proper Selection Function
      02 April 2025, at CASCADE, Saint-Etienne, France
      [slides]
  • Attacks and Countermeasures in Persistent Fault Model
      01 October 2024, at JAIF, Rennes, France
      [slides][poster]
  • Resistance of Threshold Implementations against Statistical (Ineffective) Fault Attacks
      18 June 2024, at Journée de la Recherche, Saint-Étienne, France
      Finalist in poster competition (top 11 among ~100), selected for presentation
      [slides][poster][video]
  • Differential and Correlation Power Analysis on Ascon
      06 June 2024, at SESAM seminar, in Laboratoire Hubert Curien, Saint-Étienne, France
      [slides]
  • Persistent Fault Model: Generalization, Cryptanalysis and Countermeasures
      16 October 2023, at Journées C2, in Najac, France
      [slides]
  • Linear Cryptanalysis and Countermeasures in Persistent Fault Model
      22 June 2023, at SESAM seminar (ANR PROPHY project), in Laboratoire Hubert Curien, Saint-Étienne, France
      [slides]

    • # Services

    External Reviewer: EuroCrypt 2024, EuroCrypt 2025


    # Teaching

    2024--2025

  • C++ programming for first year bachelor students at IUT Saint-Étienne. (6h)

    • 2023--2024

  • Embedded programming on CodeWarrior for second year bachelor students at IUT Saint-Étienne. (27h)
  • C++ programming for first year bachelor students at IUT Saint-Étienne. (27h)

    • 2022--2023

  • Embedded programming on CodeWarrior for second year bachelor students at IUT Saint-Étienne. (27h)

    • # Master Thesis

      Secure Wallet Application for Cryptocurrency and Blockchain Transactions
      6 September 2021, at University of Limoges, France
      [thesis] [slides]

    # Contact

    Mail:
      nvietsang [at] gmail.com
      viet.sang.nguyen [at] univ-st-etienne.fr

    Address:
      Laboratoire Hubert Curien, Bâtiment F
      18 rue du Professeur Benoît Lauras
      42100, Saint-Étienne, France


    # Others