He received his Ph.D. in 1995 from the École nationale supérieure des télécommunications. Naccache's most notable work is in public-key cryptography, including the cryptanalysis of digital signature schemes. Together with Jacques Stern he designed the similarly named but very distinct Naccache-Stern cryptosystem and Naccache-Stern knapsack cryptosystem.
In 2004 David Naccache and Claire Whelan, then employed by Gemplus International, used image processing techniques to uncover redacted information from the declassified 6 August 2001 President's Daily Brief Bin Ladin Determined To Strike in US. They also demonstrated how the same process could be applied to other redacted documents.
In 2021, two epidemiologists denounced David Naccache to the management of the École normale supérieure. They accused him of having produced a fraudulent report in November 2018 for Genevrier Laboratories in exchange for a large payment (more than €250,000) in defence of a delisted drug, Chondrosulf.
In 2020 Naccache was listed as a Fellow of the IACR, the International Association for Cryptologic Research, "for significant contributions to applied cryptography in industry and academia, and for the service to the IACR."
- Markoff, John (10 May 2004). "Illuminating Blacked-Out Words". The New York Times. Archived from the original on May 6, 2009. Retrieved 16 April 2009.
- "Information Security Staff Directory". Information Security Group. Retrieved 2019-05-17.
- "Les expertises suspectes d'un professeur de l'Ecole normale supérieure autour d'un médicament controversé". Le Monde.fr (in French). 2021-09-29. Retrieved 2021-10-01.
|Wikimedia Commons has media related to David Naccache.|
- David Naccache's personal page (in French).