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  2. D-Day Daily Telegraph crossword security alarm - Wikipedia

    en.wikipedia.org/wiki/D-Day_Daily_Telegraph...

    On 18 August 1942, a day before the Dieppe raid, 'Dieppe' appeared as an answer in The Daily Telegraph crossword (set on 17 August 1942) (clued "French port"), causing a security alarm. The War Office suspected that the crossword had been used to pass intelligence to the enemy and called upon Lord Tweedsmuir , then a senior intelligence officer ...

  3. The Clue in the Crossword Cipher - Wikipedia

    en.wikipedia.org/wiki/The_Clue_in_the_Crossword...

    The Clue in the Crossword Cipher is the forty-fourth volume in the Nancy Drew Mystery Stories series. [1] It was first published in 1967 under the pseudonym Carolyn Keene . [ 2 ] The actual author was ghostwriter Harriet Stratemeyer Adams .

  4. Cryptanalysis of the Enigma - Wikipedia

    en.wikipedia.org/wiki/Cryptanalysis_of_the_Enigma

    By 1938 Rejewski had invented a device, the cryptologic bomb, and Henryk Zygalski had devised his sheets, to make the cipher-breaking more efficient. Five weeks before the outbreak of World War II, in late July 1939 at a conference just south of Warsaw , the Polish Cipher Bureau shared its Enigma-breaking techniques and technology with the ...

  5. The Thing (listening device) - Wikipedia

    en.wikipedia.org/wiki/The_Thing_(listening_device)

    The device, embedded in a carved wooden plaque of the Great Seal of the United States, was used by the Soviet government to spy on the US. On August 4, 1945, several weeks before the end of World War II , a delegation from the Young Pioneer Organization of the Soviet Union presented the bugged carving to Ambassador Harriman, as a "gesture of ...

  6. Enigma machine - Wikipedia

    en.wikipedia.org/wiki/Enigma_machine

    The Enigma machine is a cipher device developed and used in the early- to mid-20th century to protect commercial, diplomatic, and military communication. It was employed extensively by Nazi Germany during World War II, in all branches of the German military. The Enigma machine was considered so secure that it was used to encipher the most top ...

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  8. List of fictional secret agents - Wikipedia

    en.wikipedia.org/wiki/List_of_fictional_secret...

    Mitch Rapp, CIA agent in counterterrorism unit known as the "Orion Team" in books by Vince Flynn; Modesty Blaise, from the books by Peter O'Donnel; Nancy Drew in Carolyn Keene's books; Nick Carter-Killmaster (books) Normanby in P.G. Dixon's 2021 book Normanby; Paul Kagan in David Morrell's 2008 novel The Spy Who Came for Christmas

  9. Dead drop - Wikipedia

    en.wikipedia.org/wiki/Dead_drop

    A dead drop spike is a concealment device similar to a microcache. It has been used since the late 1960s to hide money, maps, documents, microfilm , and other items. The spike is resistant to water and mildew and can be placed in the ground or submerged in a shallow stream for later retrieval.

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