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  2. Secret decoder ring - Wikipedia

    en.wikipedia.org/wiki/Secret_decoder_ring

    A secret decoder ring (or secret decoder) is a device that allows one to decode a simple substitution cipher—or to encrypt a message by working in the opposite direction. [ 1 ] As inexpensive toys, secret decoders have often been used as promotional items by retailers, as well as radio and television programs, from the 1930s through to the ...

  3. Mastermind (board game) - Wikipedia

    en.wikipedia.org/wiki/Mastermind_(board_game)

    Both players simultaneously play code maker and code breaker. Parker Mastermind: 1993 8 4 Mastermind for Kids: 1996 6 3 Animal theme Mastermind Secret Search: 1997 26 letters 3-6 Valid words only; clues are provided letter-by-letter using up/down arrows for earlier/later in the alphabet. Electronic Hand-Held Mastermind (Hasbro) 1997 6 4

  4. Varicode - Wikipedia

    en.wikipedia.org/wiki/Varicode

    Beginning with the single-bit code "1", valid varicode values may be formed by prefixing a "1" or "10" to a shorter code. Thus, the number of codes of length n is equal to the Fibonacci number F n. Varicode uses the 88 values of lengths up to 9 bits, and 40 of the 55 codes of length 10.

  5. Code-O-Graph - Wikipedia

    en.wikipedia.org/wiki/Code-O-Graph

    The design had the cipher alphabet and number disks coupled by friction, and there was often slippage when trying to decipher a message. Unlike any other Code-O-Graph, the cipher-key settings utilized a pointer on the back, and a number scale from 1 through 26. Each would increment the positioning of the two scales. 1941 Key-O-Matic Code-O-Graph

  6. Jefferson disk - Wikipedia

    en.wikipedia.org/wiki/Jefferson_disk

    A disk cipher device of the Jefferson type from the 2nd quarter of the 19th century in the National Cryptologic Museum. The Jefferson disk, also called the Bazeries cylinder or wheel cypher, [1] was a cipher system commonly attributed to Thomas Jefferson that uses a set of wheels or disks, each with letters of the alphabet arranged around their edge in an order, which is different for each ...

  7. Tap code - Wikipedia

    en.wikipedia.org/wiki/Tap_code

    The knock code is featured in Arthur Koestler's 1941 work Darkness at Noon. [6] Kurt Vonnegut's 1952 novel Player Piano also includes a conversation between prisoners using a form of tap code. The code used in the novel is more primitive and does not make use of the Polybius square (e.g. "P" consists of sixteen taps in a row).

  8. Mnemonic major system - Wikipedia

    en.wikipedia.org/wiki/Mnemonic_major_system

    Numzi - free web application for converting numbers to words/phrases and vice versa using the Major System. Covers the English language with over 220,000 words. Numzi also has an iOS app which is a portable Major System number-word converter. 2Know is free Windows software for converting numbers to words (English, German, French).

  9. Telegraph code - Wikipedia

    en.wikipedia.org/wiki/Telegraph_code

    The code book was revised and simplified in 1795 to speed up transmission. The code was in two divisions, the first division was 94 alphabetic and numeric characters plus some commonly used letter combinations. The second division was a code book of 94 pages with 94 entries on each page. A code point was assigned for each number up to 94.

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