190:, even though plain text effectively chosen by the British was injected into the ciphertext, because the choice was very limited and the cryptanalysts did not care what the crib was so long as they knew it. Most chosen-plaintext cryptanalysis requires very specific patterns (e.g. long repetitions of "AAA...", "BBB...", "CCC...", etc.) which could not be mistaken for normal messages. It does, however, show that the boundary between these two is somewhat fuzzy.
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197:. U.S. cryptanalysts had decrypted numerous Japanese messages about a planned operation at "AF", but the code word "AF" came from a second location code book which was not known. Suspecting it was Midway island, they arranged for the garrison there to report in the clear about a breakdown of their desalination plant. A Japanese report about "AF" being short of fresh water soon followed, confirming the guess.
155:", in their encrypted messages. This term presumably came from RAF minelaying missions, or "gardening" sorties. "Gardening" was standard RAF slang for sowing mines in rivers, ports and oceans from low heights, possibly because each sea area around the European coasts was given a code-name of flowers or vegetables.
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Park were in need of some cribs, they might (and apparently did on several occasions) request that the area be mined again. This would hopefully evoke encrypted messages from the local command mentioning
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ships to assign to that location, mentioning the same. It worked often enough to try several times.
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The technique is claimed to have been most effective against messages produced by the German Navy's
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Schemes to entice the
Germans to include known plaintext during World War II
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Morris, Christopher (1993), "Navy Ultra's Poor
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239:, Oxford: Oxford University Press, p. 235,
237:Codebreakers: The inside story of Bletchley Park
264:Station X: The Codebreakers of Bletchley Park
193:Another notable example occurred during the
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111:Learn how and when to remove this message
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