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 Transactions6 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