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  2. Caesar cipher - Wikipedia

    en.wikipedia.org/wiki/Caesar_cipher

    Caesar cipher. The action of a Caesar cipher is to replace each plaintext letter with a different one a fixed number of places down the alphabet. The cipher illustrated here uses a left shift of 3, so that (for example) each occurrence of E in the plaintext becomes B in the ciphertext. In cryptography, a Caesar cipher, also known as Caesar's ...

  3. Pigpen cipher - Wikipedia

    en.wikipedia.org/wiki/Pigpen_cipher

    The pigpen cipher (alternatively referred to as the masonic cipher, Freemason's cipher, Rosicrucian cipher, Napoleon cipher, and tic-tac-toe cipher) [2] [3] is a geometric simple substitution cipher, which exchanges letters for symbols which are fragments of a grid. The example key shows one way the letters can be assigned to the grid.

  4. Tap code - Wikipedia

    en.wikipedia.org/wiki/Tap_code

    X. Y. Z. The tap code, sometimes called the knock code, is a way to encode text messages on a letter-by-letter basis in a very simple way. The message is transmitted using a series of tap sounds, hence its name. [1] The tap code has been commonly used by prisoners to communicate with each other. The method of communicating is usually by tapping ...

  5. 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 ...

  6. Leet - Wikipedia

    en.wikipedia.org/wiki/Leet

    Say, girl name "Marisa" can be spelled as /\/\AR15/\ - with a reference to the AR-15 platform. Alternatively, an abbreviation can be leet-ified into a valid hexadecimal color code "614D05" is a valid HEX-code for a dark shade of gold color, referencing to GLaDOS; "572E55" (or "572355") is a dark purple color, coming from "STRESS" word;

  7. Code talker - Wikipedia

    en.wikipedia.org/wiki/Code_talker

    A code talker was a person employed by the military during wartime to use a little-known language as a means of secret communication. The term is most often used for United States service members during the World Wars who used their knowledge of Native American languages as a basis to transmit coded messages.

  8. Enochian - Wikipedia

    en.wikipedia.org/wiki/Enochian

    Enochian. Enochian ( / ɪˈnoʊkiən / ə-NOH-kee-ən) is an occult constructed language [3] — said by its originators to have been received from angels — recorded in the private journals of John Dee and his colleague Edward Kelley in late 16th-century England. [4] Kelley was a scryer who worked with Dee in his magical investigations.

  9. Beale ciphers - Wikipedia

    en.wikipedia.org/wiki/Beale_ciphers

    A pamphlet published in 1885, entitled The Beale Papers, is the source of this story.The treasure was said to have been obtained by an American named Thomas J. Beale in the early 1800s, from a mine to the north of Nuevo México (New Mexico), at that time in the Spanish province of Santa Fe de Nuevo México (an area that today would most likely be part of Colorado).