In 1949, in a declassified version of his wartime work on the mathematical theory of cryptography (" Communication Theory of Secrecy Systems "), he proved that all theoretically unbreakable ciphers must have the same requirements as the one-time pad . He is also credited with the introduction of sampling theory , which is concerned with representing a continuous-time signal from a (uniform) discrete set of samples. This theory was essential in enabling telecommunications to move from analog to digital transmissions systems in the 1960s and later.
I have been involved with the Parent-Teacher Association at the local primary school since my elder son first started there. The PTA organises a number of fund-raising events which have involved me in persuading people to buy raffle tickets, display posters in shop windows, donate prizes, etc. Three years ago, the PTA produced a book to mark the school's 25th anniversary and, as a member of the editorial committee, I helped to decide on the content and format of this book.
The school governors wanted an "official" history, but I represented the PTA in arguing that a collection of reminiscences of past pupils would be more readable and saleable. This was agreed and we then contacted ex-pupils through mailshots based on old school registers and features in the local newspaper and on local radio. The response was excellent and the only problem was in sifting and editing the letters we were sent.
I then negotiated with local printers to find the best quote and
persuaded local shops of all kinds (not just booksellers) to sell the publication.