Drawing extensively (and with due acknowledgement) on Kahn's
exhaustive 1,164-page Code-breakers (1967) and on Gardner's own
considerable expertise in the field of mathematical games and
puzzles, this is a stimulating must for the intermediate
cryptographer who has outgrown Zim's model introduction and wants
more nitty-gritty brainwork than Laffin's historical treatment
provides. Gardner covers easy transposition and substitution
ciphers and harder polyalphabetic ones, as well as grilles (grids),
various kinds of invisible writing and "bizarre methods" of sending
codes, with examples, anecdotes, a little theory, and instructions
on breaking and composing ciphers. He explains even the more
difficult examples with admirable clarity, alludes to literature
(frequently), history, math and science (including the genetic
code) with fingertip control, ends with a discussion of radio codes
prepared for interplanetary communication, and appends an excellent
annotated bibliography. (Kirkus Reviews)
Experiment with cryptography-the science of secret writing. Cipher and decipher codes: transposition and polyalphabetical ciphers, famous codes, typewriter and telephone codes, codes that use playing cards, knots, and swizzle sticks...even invisible writing and sending messages through outer space. Hours of intrigue and challenge. 45 diagrams.
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