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  2. Play Letter Garden Online for Free - AOL.com

    www.aol.com/games/play/masque-publishing/letter...

    Enjoy a word-linking puzzle game where you clear space for flowers to grow by spelling words.

  3. Playfair cipher - Wikipedia

    en.wikipedia.org/wiki/Playfair_cipher

    The German Army, Air Force and Police used the Double Playfair cipher as a medium-grade cipher in WWII, based on the British Playfair cipher they had broken early in WWI. [16] They adapted it by introducing a second square from which the second letter of each bigram was selected, and dispensed with the keyword, placing the letters in random order.

  4. 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 ...

  5. Mathematical Alphanumeric Symbols - Wikipedia

    en.wikipedia.org/wiki/Mathematical_Alphanumeric...

    Mathematical Alphanumeric Symbols is a Unicode block comprising styled forms of Latin and Greek letters and decimal digits that enable mathematicians to denote different notions with different letter styles. The letters in various fonts often have specific, fixed meanings in particular areas of mathematics.

  6. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    Historically, upper-case letters were used for representing points in geometry, and lower-case letters were used for variables and constants. Letters are used for representing many other types of mathematical object. As the number of these types has increased, the Greek alphabet and some Hebrew letters have also come to be used

  7. Caesar cipher - Wikipedia

    en.wikipedia.org/wiki/Caesar_cipher

    When each letter is replaced with the letter before it in the Hebrew alphabet the text translates as "YHWH, our God, YHWH", a quotation from the main part of the scroll. [ 9 ] [ 10 ] In the 19th century, the personal advertisements section in newspapers would sometimes be used to exchange messages encrypted using simple cipher schemes.

  8. Cipher - Wikipedia

    en.wikipedia.org/wiki/Cipher

    The ciphertext message contains all the information of the plaintext message, but is not in a format readable by a human or computer without the proper mechanism to decrypt it. The operation of a cipher usually depends on a piece of auxiliary information, called a key (or, in traditional NSA parlance, a cryptovariable). The encrypting procedure ...

  9. Bulls and cows - Wikipedia

    en.wikipedia.org/wiki/Bulls_and_Cows

    The game play for the word version is as follows. One player (the host) thinks of an isogram word (i.e. no letter appears twice) and, if the word length is not pre-determined, announces the number of letters in the word. Other players (the guessers) try to figure out that word by guessing isogram words containing the same number of letters.

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