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  2. Secret Number - Wikipedia

    en.wikipedia.org/wiki/Secret_Number

    Secret Number's official logo. According to the group, their name means that, "Everyone has a secret number [for a password or PIN code], which is usually a birthday, anniversary, or some other special number.

  3. Numbers station - Wikipedia

    en.wikipedia.org/wiki/Numbers_station

    Cuban numbers station HM01. A recording of The Gong numbers station, run by the National People's Army of the German Democratic Republic, from 1988. A numbers station is a shortwave radio station characterized by broadcasts of formatted numbers, which are believed to be addressed to intelligence officers operating in foreign countries. [1]

  4. Enigma machine - Wikipedia

    en.wikipedia.org/wiki/Enigma_machine

    The Abwehr code had been broken on 8 December 1941 by Dilly Knox. Agents sent messages to the Abwehr in a simple code which was then sent on using an Enigma machine. The simple codes were broken and helped break the daily Enigma cipher. This breaking of the code enabled the Double-Cross System to operate. [19]

  5. List of U.S. security clearance terms - Wikipedia

    en.wikipedia.org/wiki/List_of_U.S._security...

    T3 or T3R - Tier 3 or Tier 3 Reinvestigation, now replace all NACLC. T5 and T5R - Tier 5 or Tier 5 Reinvestigation, now replace SSBI and SBPR respectively. Yankee White – An investigation required for personnel working with the President and Vice President of the United States. Obtaining such clearance requires, in part, an SSBI.

  6. Secret Service code name - Wikipedia

    en.wikipedia.org/wiki/Secret_Service_code_name

    Secret Service code name. President John F. Kennedy, codename "Lancer" with First Lady Jacqueline Kennedy, codename "Lace". The United States Secret Service uses code names for U.S. presidents, first ladies, and other prominent persons and locations. [1] The use of such names was originally for security purposes and dates to a time when ...

  7. 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 ...

  8. Cryptography - Wikipedia

    en.wikipedia.org/wiki/Cryptography

    This is an accepted version of this page This is the latest accepted revision, reviewed on 10 September 2024. Practice and study of secure communication techniques "Secret code" redirects here. For the Aya Kamiki album, see Secret Code. "Cryptology" redirects here. For the David S. Ware album, see Cryptology (album). This article needs additional citations for verification. Please help improve ...

  9. Unlisted number - Wikipedia

    en.wikipedia.org/wiki/Unlisted_number

    The first type secret number was typically used by celebrities (in this case the address was hidden as well). The second type unlisted number was not listed in the (paper based) phone book, but was listed on the directory service (a voice call to 018 in the 1970s).