David Naccache is a cryptographer, currently a professor at Panthéon-Assas University and member of the École normale supérieure's Computer Laboratory. 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.
- 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.
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