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  2. Patricia Davies (codebreaker) - Wikipedia

    en.wikipedia.org/wiki/Patricia_Davies_(codebreaker)

    They were where secret German military communications were intercepted, transcribed and, if in a code other than morse, passed on to Bletchley Park. Owtram's first post was in Yorkshire. She later transferred to Lyme Regis in 1943 as Chief Petty Officer, and then to Dover (opposite Cape Gris Nez) where she turned 21 two weeks after D Day. In Y ...

  3. American Morse code - Wikipedia

    en.wikipedia.org/wiki/American_Morse_code

    The code was adopted as the European standard in 1865, and was known at first as "Continental Morse," although as its use spread it also became known as "International Morse." At this point the original Morse Code started to be called American Morse, to differentiate between the two main standards.

  4. Hermeticism - Wikipedia

    en.wikipedia.org/wiki/Hermeticism

    Hermeticism, or Hermetism, is a philosophical and religious tradition rooted in the teachings attributed to Hermes Trismegistus, a syncretic figure combining elements of the Greek god Hermes and the Egyptian god Thoth.

  5. International Code of Signals - Wikipedia

    en.wikipedia.org/wiki/International_Code_of_Signals

    The International Code of Signals was preceded by a variety of naval signals and private signals, most notably Marryat's Code, the most widely used code flags prior to 1857. What is now the International Code of Signals was drafted in 1855 by the British Board of Trade and published in 1857 as the Commercial Code.

  6. Cryptanalysis of the Enigma - Wikipedia

    en.wikipedia.org/wiki/Cryptanalysis_of_the_Enigma

    The only remaining secret of the daily key would be the ring settings, and the Poles would attack that problem with brute force. Most messages would start with the three letters "ANX" (an is German for "to" and the "X" character was used as a space). It may take almost 26×26×26=17576 trials, but that was doable. Once the ring settings were ...

  7. Russian Morse code - Wikipedia

    en.wikipedia.org/wiki/Russian_Morse_code

    The Russian Morse code approximates the Morse code for the Latin alphabet.It was enacted by the Russian government in 1856. [1] [2]To memorize the codes, practitioners use mnemonics known as напевы (loosely translated "melodies" or "chants").

  8. Classified information in the United States - Wikipedia

    en.wikipedia.org/wiki/Classified_information_in...

    Top Secret is the highest level of classification. However some information is further categorized/marked by adding a code word so that only those who have been cleared for each code word can see it. A document marked SECRET (CODE WORD) could be viewed only by a person with a secret or top secret clearance and that specific code word clearance.

  9. Steganography - Wikipedia

    en.wikipedia.org/wiki/Steganography

    The same image viewed by white, blue, green, and red lights reveals different hidden numbers. Steganography (/ ˌ s t ɛ ɡ ə ˈ n ɒ ɡ r ə f i / ⓘ STEG-ə-NOG-rə-fee) is the practice of representing information within another message or physical object, in such a manner that the presence of the concealed information would not be evident to an unsuspecting person's examination.