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  2. 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 ...

  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. Caesar cipher - Wikipedia

    en.wikipedia.org/wiki/Caesar_cipher

    In cryptography, a Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code, or Caesar shift, is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet.

  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

    However, leet is also seen in situations where the argot (e.g. secret language) characteristics of the system are required, either to exclude newbies or outsiders in general, i.e., anything that the average reader cannot make sense of is valid; a valid reader should themselves try to make sense, if deserving of the underlying message.

  7. Book cipher - Wikipedia

    en.wikipedia.org/wiki/Book_cipher

    Book cipher. The King James Bible, a highly available publication suitable for the book cipher. A book cipher is a cipher in which each word or letter in the plaintext of a message is replaced by some code that locates it in another text, the key . A simple version of such a cipher would use a specific book as the key, and would replace each ...

  8. Hexspeak - Wikipedia

    en.wikipedia.org/wiki/Hexspeak

    Hexspeak. Hexspeak is a novelty form of variant English spelling using the hexadecimal digits. Created by programmers as memorable magic numbers, hexspeak words can serve as a clear and unique identifier with which to mark memory or data. Hexadecimal notation represents numbers using the 16 digits 0123456789ABCDEF.

  9. Nsibidi - Wikipedia

    en.wikipedia.org/wiki/Nsibidi

    Nsibidi (also known as nsibiri, [2] nchibiddi or nchibiddy [3]) is a system of symbols or proto-writing developed by the Ekpe secret society that traversed the southeastern part of Nigeria . They are classified as pictograms, though there have been suggestions that some are logograms or syllabograms. [4]