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David Naccache

David Naccache is a cryptographer and a professor at the École normale supérieure, known for his work in public-key cryptography.

born 1967Public-key cryptography researchThe Naccache-Stern cryptosystemUncovering redacted document text

Born: 21 February 1967, Beersheba
Occupation: cryptographer, engineer, consultant, expert witness
Education: Télécom Paris

David Naccache was born in 1967 in Beersheba

David Naccache was born on February 21, 1967, in Beersheba. He earned his Ph.D. in 1995 from the École nationale supérieure des télécommunications.

His work focuses on public-key cryptography, including the analysis of digital signature schemes. With Jacques Stern he designed the Naccache-Stern cryptosystem and the separate Naccache-Stern knapsack cryptosystem.

In 2004, while at Gemplus International, he and Claire Whelan used image processing to reveal hidden text in a declassified US presidential brief from August 6, 2001. They also showed the method could work on other redacted documents.

He taught at Panthéon-Assas University before joining the École normale supérieure, and he is a visiting professor at Royal Holloway, University of London. In 2020 he was named a Fellow of the International Association for Cryptologic Research.

In 2021, two epidemiologists accused him of writing a report in 2018 for Genevrier Laboratories in defense of the drug Chondrosulf. On August 28, 2024, the Superior Court of Quebec rejected the lawsuit and awarded costs to the defendants, including Naccache.