Fred Piper has worked in security since 1979. In 1985 he formed a company, Codes & Ciphers Ltd, which offers consultancy advice in all aspects of information security. He has lectured worldwide on a wide range of topics in information security, both academically and commercially.
Sean Murphy is a professor in the School of Mathematics and Information Security at Royal Holloway, University of London. He is coauthor, with Fred Piper, of Cryptography: A Very Short Introduction.