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  2. 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 ... There is a numeral variety of the Mastermind in which a 4-digit number ...

  3. 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]

  4. Nihilist cipher - Wikipedia

    en.wikipedia.org/wiki/Nihilist_cipher

    Nihilist cipher. In the history of cryptography, the Nihilist cipher is a manually operated symmetric encryption cipher, originally used by Russian Nihilists in the 1880s to organize terrorism against the tsarist regime. The term is sometimes extended to several improved algorithms used much later for communication by the First Chief ...

  5. Code Breaker - Wikipedia

    en.wikipedia.org/wiki/Code_Breaker

    Code Breaker was a cheat device developed by Pelican Accessories, which were available for PlayStation, PlayStation 2, Dreamcast, Game Boy Color, Game Boy Advance, and Nintendo DS. Along with competing product Action Replay , it is one of the few currently supported video game cheat devices.

  6. Short code - Wikipedia

    en.wikipedia.org/wiki/Short_code

    Short code. Short codes, or short numbers, are short digit-sequences—significantly shorter than telephone numbers —that are used to address messages in the Multimedia Messaging System (MMS) and short message service (SMS) systems of mobile network operators. [1] In addition to messaging, they may be used in abbreviated dialing.

  7. 6174 - Wikipedia

    en.wikipedia.org/wiki/6174

    All other four-digit numbers eventually reach 6174 if leading zeros are used to keep the number of digits at 4. For numbers with three identical digits and a fourth digit that is one higher or lower (such as 2111), it is essential to treat 3-digit numbers with a leading zero; for example: 2111 – 1112 = 0999; 9990 – 999 = 8991; 9981 – 1899 ...

  8. What's a six-digit verification code — and why you should ...

    www.aol.com/whats-six-digit-verification-code...

    BBB has warned in the past about a scam on Facebook Marketplace where scammers posed as buyers and requested a seller’s phone number and six-digit code to “verify the seller is real.”. The ...

  9. Quaternary numeral system - Wikipedia

    en.wikipedia.org/wiki/Quaternary_numeral_system

    e. Quaternary / kwəˈtɜːrnəri / is a numeral system with four as its base. It uses the digits 0, 1, 2, and 3 to represent any real number. Conversion from binary is straightforward. Four is the largest number within the subitizing range and one of two numbers that is both a square and a highly composite number (the other being thirty-six ...