David Naccache

David Naccache is a cryptographer, currently Vice President of Research and Innovation for smart card manufacturer Gemplus, where he manages the Applied Research and Security Center. He is also a visiting professor at Royal Holloway University of London's Information Security Group. He received his Ph.D. in 1995 from the École Nationale Supérieure des Télécommunications. Naccache's notable work includes the design of the block ciphers SHACAL and xmx, as well as substantial work 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.