Some of the advances in mechanical and electronic computers occurred during World War II in conjunction with message encoding and decoding and cryptanalysis (code breaking). Some of the details were,...

Some of the advances in mechanical and electronic computers occurred during World War II in conjunction with message encoding and decoding and cryptanalysis (code breaking). Some of the details were, and still are, classified as secret. Find out as much as you can about these machines and compare them with those reported on in Section 1.2.1. Hint: Look in Randall [1975, pp. 327, 328] and Clark [1977, pp. 134, 135, 140, 151, 195, 196]. Also, search the Web for key words: Sigaba, Enigma, T. H. Flowers, William F. Friedman, Alan Turing, and any patents by Friedman.