   the code book: the science of secrecy from ancient egypt to quantum cryptography is a book by simon singh, published in new york in 1999 by doubleday; isbn 0-385-49531-5. ==contents== the code book covers diverse historical topics including the man in the iron mask, arabic cryptography, charles babbage, the mechanisation of cryptography, the enigma machine, and the decryption of linear b and other ancient writing systems. later sections cover the development of public-key cryptography. some of this material is based on interviews with participants, including persons who worked in secret at gchq. the book concludes with a discussion of "pretty good privacy" (pgp), quantum computing, and quantum cryptography. the book announced a "cipher challenge" of a series of ten progressively harder ciphers, with a cash prize of Â£10,000 which has since been won. the book is not footnoted but has a "further reading" section at the end, organized by chapter. ==references== * "of riddles wrapped in enigmas", whitfield diffie, the times higher education supplement, september 10, 1999, p.&nbsp;25. retrieved 2009-02-19. * "the code book: the evolution of secrecy from mary, queen of scots to quantum cryptography, reviewed by jim reeds", jim reeds, notices of the american mathematical society, vol. 47, no. 3, march 2000, pp.&nbsp;369â72. retrieved 2009-02-19. (61k pdf)].  ==external links== * "the code book" web page at simon singh's site 
1999_books Cryptography_books English-language_books Popular_science_books