Ky Nguyen

Full name: Nguyễn Ngọc Kỷ

I'm a PhD candidate in Cryptography at École normale supérieure under the supervision of David Pointcheval and Duong Hieu Phan. Previously I was normalien at École normale supérieure (Computer Science 2018) and alumnus (no graduation) at Ho Chi Minh City University of Technology (K2015).

Research

Preprints

1. Ky Nguyen, Duong Hieu Phan, David Pointcheval: Multi-Client Functional Encryption with Public Inputs and Strong Security. Cryptology ePrint Archive, Report 2024/740 (2024) [Paper]
2. Ky Nguyen, David Pointcheval, Robert Schädlich: Dynamic Decentralized Functional Encryption with Strong Security. Cryptology ePrint Archive, Report 2022/1532 (2022) [Paper]
(Old title: Function-Hiding Dynamic Decentralized Functional Encryption for Inner Products.)

Journal paper

1. Marc Joye, Oleksandra Lapiha, Ky Nguyen, David Naccache: The Eleventh Power Residue Symbol. Journal of Mathematical Cryptology 15(1), 111 - 122 (2021) [Paper]

Conference papers

1. Julia Kastner, Ky Nguyen, Michael Reichle: Pairing-Free Blind Signatures from Standard Assumptions in the ROM. In: Advances in Cryptology - IACR CRYPTO 2024. Springer (2024) [Paper]
2. Ky Nguyen, Duong Hieu Phan, David Pointcheval: Optimal Security Notion for Decentralized Multi-Client Functional Encryption. In: Proceedings of the 21st International Conference on Applied Cryptography and Network Security (ACNS' 23). Springer (2023). [Paper]
3. Ky Nguyen, Duong Hieu Phan, David Pointcheval: Multi-Client Functional Encryption with Fine-Grained Access Control. In: Advances in Cryptology - IACR ASIACRYPT 2022. Springer (2022) [Paper]
4. Benoît Libert, Ky Nguyen, Alain Passelègue: Cumulatively All-Lossy-But-One Trapdoor Functions from Standard Assumptions. In: Proceedings of the 13th Conference on Security in Communication Networks (SCN' 22). Springer (2022) [Paper]
5. Ky Nguyen, Miguel Ambrona, Masayuki Abe: WI is Almost Enough: Contingent Payment All Over Again. In: Proceedings of the 2020 ACM SIGSAC Conference on Computer and Communications Security (CCS' 20). Association for Computing Machinery, New York, NY, USA (2020) [Paper] [Tool]

Teaching

• Spring 2024: Initiation à la Cryptologie at École normale supérieure (Tutorials)
• Autumn 2022, 2023: Introduction to Zero-Knowledge Proofs at ESILV (Lectures + Tutorials)
• Autumn 2022: Symmetric Cryptography at ESILV (Lectures + Tutorials)
• Spring 2022: Asymmetric Cryptography at ESILV (Lectures + Tutorials)

Professional/Academic Service

• External reviewer for: Designs, Codes and Cryptography ; Journal of Cryptology ; Asiacrypt (2022) ; Crypto (2023) ; Eurocrypt (2024,2023) ; PKC (2024,2023)
• Member in: the Scientific Council of École normale supérieure (Mandate 2023-2025)

Contact