The poem, 'The Life That I Have', also known as 'Yours', recited to Violette by her husband Etienne, was once believed to have been written especially for the film, but was in fact the actual code poem given to her in March 1944 by the SOE cryptographer Leo Marks, and written by him on Christmas Eve 1943 in memory of his girlfriend, Ruth, who had recently died in a car crash.
Like many "cloak-and-dagger" novelists, Hagberg has a professional background in espionage, having spent his stint of military duty as a cryptographer for U.S. Air Force Intelligence.
David Naccache is a cryptographer, currently a professor at Panthéon-Assas University and member of the École normale supérieure's Computer Laboratory.
The cryptographer and computing pioneer Alan Turing (1912–1954) was uncle to the present Baronet, Sir John Dermot Turing.
Frank W. Lewis (1912–2010), cryptographer and crossword compiler
Frank Waring Lewis (August 25, 1912 – November 18, 2010) was an American cryptographer and cryptic crossword compiler.
Gregory G. Rose (born 1955), Australian-born American cryptographer
Donald Knuth notes that Hans Peter Luhn of IBM appears to have been the first to use the concept, in a memo dated January 1953, and that Robert Morris used the term in a survey paper in CACM which elevated the term from technical jargon to formal terminology.
Landon Curt Noll (1979), astronomer, cryptographer and mathematician
Jacques Stern (born 1949) is a cryptographer, currently a professor at the École Normale Supérieure, where he is Director of the Computer Science Laboratory.
Jennifer Roma Seberry is an Australian cryptographer, mathematician, and computer scientist, currently a professor at the University of Wollongong, Australia.
The M-209 was designed by Swedish cryptographer Boris Hagelin in response to a request for such a portable cipher machine, and was an improvement of an earlier machine, the C-36.
Matthew D. Green, cryptographer and Assistant Research Professor at Johns Hopkins University
Paulo Pancatuccio was a 16th-century cryptographer born in Volterra and employed by the Pope to break enciphered documents.
Bruce Schneier, American cryptographer, computer security specialist, and writer
Claus P. Schnorr (born 1943), German mathematician and cryptographer
Thomas Jakobsen, mathematician, cryptographer, and computer programmer