Code and ciphers: Julius Caesar, the Enigma and the internet

References
Chapter 1
[1.1] Hill, R.: A First Course in Coding Theory, Oxford University Press (1986). Assumes
high school mathematics, including matrices.
[1.2] Welsh, Dominic: Codes and Cryptography, Oxford Science Publications (1988).
Undergraduate level, mathematics, computer science etc.
[1.3] Berlekamp, E.R.: Algebraic Coding Theory, McGraw-Hill, New York (1968). Pretzel,
Oliver: Error-Correcting Codes and Finite Fields, Clarendon Press, Oxford (1992).
Postgraduate-level texts.
[1.4] Chadwick, J.: The Decipherment of Linear B, Cambridge University Press (1958).
Describes the solution, in 1952, by Michael Ventris (who was killed in an
accident in 1956). A celebrated earlier feat was the decipherment of the
hieroglyphics of the Rosetta Stone by J.F. Champollion, but he, unlike Ventris,
had the advantage of a ‘parallel text’ in a known language. Anyone interested in
attempting to decipher unsolved scripts might care to investigate the Beale
Ciphers or Voynich Manuscript; but such endeavours are not for the fainthearted.
At a more serious level there are texts in various unknown languages,
including Linear A, awaiting solution.
[1.5] Public Records Office: garbo: The Spy Who Saved D-Day, PRO, Richmond, Surrey
(2000). Appendix XXXVI deals with ‘Secret inks’.
Chapter 2
[2.1] In 1968 the author was asked to decipher part of the diary that Wittgenstein kept
during his time in the Austrian Army in the 1914–18 war. It was hoped that it
might provide clues as to some of his philosophical ideas, but the pages
deciphered contained only comments on the misery of army life. If the diary has
been published I am not aware of it.
[2.2] Francis, W.N.: A Standard Sample of Present-Day Edited American English, Brown
University, Providence, Rhode Island (1964).
[2.3] Wright, E.V.: Gadsby: A Story of Over 50,000 Words without Using the Letter E, Weteel,
Los Angeles (1939).
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