![]() ![]() Along with a “crib” – a plaintext word or phrase that the message was likely to contain, and which could be tried at various positions in the text – this machine could narrow the search for the correct wheel configuration and often find it. These 36 triple-wheels corresponded to 36 consecutive positions in cyphertext. Each such machine – known as a Bombe – had 36 sets of three vertically-aligned saucer-sized wheels, and each such triple representing a possible configuration of the three wheels that lie at the heart of an Enigma machine. Turing led the development of much more advanced machines. This cypher was widely held to be impregnable, although Polish cryptanalysts made breakthroughs before the war and designed machines to implement their methods. ![]()
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