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] (There are some flaws in this paper)
  • 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

  • Correlation Power Analysis on Ascon with Multi-bit Selection Function
    11/06/2025, at SECRYPT, Bilbao, Spain
    [slides]
  • Practical Second-Order CPA Attacks on Ascon with Proper Selection Function
    02/04/2025, at CASCADE, Saint-Etienne, France
    [slides]
  • Attacks and Countermeasures in Persistent Fault Model
    01/10/2024, at JAIF, Rennes, France
    [slides][poster]
  • Resistance of Threshold Implementations against Statistical (Ineffective) Fault Attacks
    18/06/2024, 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
    06/06/2024, at SESAM seminar, in Laboratoire Hubert Curien, Saint-Étienne, France
    [slides]
  • Persistent Fault Model: Generalization, Cryptanalysis and Countermeasures
    16/10/2023, at Journées C2, in Najac, France
    [slides]
  • Linear Cryptanalysis and Countermeasures in Persistent Fault Model
    22/06/2023, at SESAM seminar, in Laboratoire Hubert Curien, Saint-Étienne, France
    [slides]

Services

External Reviewer: EuroCrypt 2024, EuroCrypt 2025

Teaching

  • Tutorials of C++ programming (33h),
    for first year bachelor students at IUT Saint-Étienne, 2023 - 2024
  • Tutorials of embedded programming on CodeWarrior (27h x3)
    for second year bachelor students at IUT Saint-Étienne, 2023 - 2024

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