Nicolas Bon

I am a PhD student and engineer in cryptography in CryptoExperts and in the CASCADE team of Ecole Normale Supérieure de Paris, under the supervision of Sonia Belaïd, David Pointcheval and Matthieu Rivain. My main topic of research is Fully Homomorphic Encryption but I have a broader interest in anything cryptography-related and more generally in privacy-preserving technologies and cybersecurity.

I am invested as well in various engineering missions within CryptoExperts, especially development, security audit and consulting.

Besides my scientific and engineering activities, I also serve as a teaching assistant at the university.

news

Nov 01, 2025	I will defend my PhD thesis on 14th of November 2025 at 10:00 am, in Salle des Actes, Ecole normale supérieure, 45 rue d’Ulm, 75005, Paris. It can be followed remotely on Zoom here. You can find the manuscript here and the slides here.

publications

Development of Optimized Operations for Homomorphic Cryptography

Nicolas Bon

Nov 2025

Bib PDF Slides

@phdthesis{phd_thesis,
  title = {Development of Optimized Operations for Homomorphic Cryptography},
  author = {Bon, Nicolas},
  year = {2025},
  month = nov,
  address = {Paris, France},
  url = {https://www.nicolasbon.com/phd},
  school = {Ecole normale supérieure - PSL},
  type = {PhD thesis},
}

Transistor: a TFHE-Friendly Stream Cipher

Jules Baudrin, Sonia Belaïd, Nicolas Bon, and 8 more authors

In Advances in Cryptology – CRYPTO 2025, Nov 2025

DOI Bib PDF Code Slides

@inproceedings{10.1007/978-3-032-01901-1_17,
  author = {Baudrin, Jules and Bela{\"i}d, Sonia and Bon, Nicolas and Boura, Christina and Canteaut, Anne and Leurent, Ga{\"e}tan and Paillier, Pascal and Perrin, L{\'e}o and Rivain, Matthieu and Rotella, Yann and Tap, Samuel},
  editor = {Tauman Kalai, Yael and Kamara, Seny F.},
  title = {Transistor: a TFHE-Friendly Stream Cipher},
  booktitle = {Advances in Cryptology -- CRYPTO 2025},
  year = {2025},
  publisher = {Springer Nature Switzerland},
  address = {Cham},
  pages = {530--565},
  isbn = {978-3-032-01901-1},
  url = {https://doi.org/10.1007/978-3-032-01901-1_17},
  doi = {10.1007/978-3-032-01901-1_17},
}

Further Improvements in AES Execution over TFHE

Sonia Belaïd, Nicolas Bon, Aymen Boudguiga, and 3 more authors

IACR Communications in Cryptology, Nov 2025

DOI Bib PDF Code

@article{10.62056/ahmp-4tw9,
  author = {Belaïd, Sonia and Bon, Nicolas and Boudguiga, Aymen and Sirdey, Renaud and Trama, Daphné and Ye, Nicolas},
  title = {Further Improvements in {AES} Execution over {TFHE}},
  volume = {2},
  number = {1},
  year = {2025},
  date = {2025-04-08},
  issn = {3006-5496},
  url = {https://doi.org/10.62056/ahmp-4tw9},
  doi = {10.62056/ahmp-4tw9},
  journal = {{IACR} Communications in Cryptology},
  publisher = {International Association for Cryptologic Research},
}

Optimized Homomorphic Evaluation of Boolean Functions

Nicolas Bon, David Pointcheval, and Matthieu Rivain

IACR Trans. Cryptogr. Hardw. Embed. Syst., Nov 2024

DOI Bib PDF Video Code Slides

@article{DBLP:journals/tches/BonPR24,
  author = {Bon, Nicolas and Pointcheval, David and Rivain, Matthieu},
  title = {Optimized Homomorphic Evaluation of Boolean Functions},
  journal = {{IACR} Trans. Cryptogr. Hardw. Embed. Syst.},
  volume = {2024},
  number = {3},
  pages = {302--341},
  year = {2024},
  url = {https://doi.org/10.46586/tches.v2024.i3.302-341},
  doi = {10.46586/TCHES.V2024.I3.302-341},
  timestamp = {Wed, 21 Aug 2024 22:05:49 +0200},
  biburl = {https://dblp.org/rec/journals/tches/BonPR24.bib},
  bibsource = {dblp computer science bibliography, https://dblp.org},
}