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  2. Book cipher - Wikipedia

    en.wikipedia.org/wiki/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 word of the plaintext by a number that gives the position where that word occurs in that book.

  3. Caps for Sale - Wikipedia

    en.wikipedia.org/wiki/Caps_for_Sale

    Caps for Sale is a popular read-aloud book, because its repetitive text permits children to speak the lines and thus join in the reading experience. It won a Lewis Carroll Shelf Award in 1958. History. The earliest known account of the story may be found in The Wilmington Centinel published in Wilmington, North Carolina January 8, 1789. "

  4. 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, 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 disk ...

  5. Alberti cipher - Wikipedia

    en.wikipedia.org/wiki/Alberti_cipher

    The Alberti Cipher disk. The Alberti Cipher, created in 1467 by Italian architect Leon Battista Alberti, was one of the first polyalphabetic ciphers. In the opening pages of his treatise De componendis cifris [] he explained how his conversation with the papal secretary Leonardo Dati about a recently developed movable type printing press led to the development of his cipher wheel.

  6. The Dangerous Book for Boys - Wikipedia

    en.wikipedia.org/wiki/The_Dangerous_Book_for_Boys

    AG106 .I38 2006. The Dangerous Book for Boys, by Conn and Hal Iggulden is a guidebook published by HarperCollins, aimed at boys "from eight to eighty." It covers around eighty topics, including how to build a treehouse, grow a crystal, or tell direction with a watch. Also included are famous quotes, stories, historical battles, and phrases that ...

  7. Cryptogram - Wikipedia

    en.wikipedia.org/wiki/Cryptogram

    A cryptogram is a type of puzzle that consists of a short piece of encrypted text. [1] Generally the cipher used to encrypt the text is simple enough that the cryptogram can be solved by hand. Substitution ciphers where each letter is replaced by a different letter or number are frequently used. To solve the puzzle, one must recover the ...

  8. Cipher disk - Wikipedia

    en.wikipedia.org/wiki/Cipher_disk

    A cipher disk is an enciphering and deciphering tool developed in 1470 by the Italian architect and author Leon Battista Alberti. He constructed a device, (eponymously called the Alberti cipher disk) consisting of two concentric circular plates mounted one on top of the other. The larger plate is called the "stationary" and the smaller one the ...

  9. Running key cipher - Wikipedia

    en.wikipedia.org/wiki/Running_key_cipher

    Running key cipher. In classical cryptography, the running key cipher is a type of polyalphabetic substitution cipher in which a text, typically from a book, is used to provide a very long keystream. The earliest description of such a cipher was given in 1892 by French mathematician Arthur Joseph Hermann (better known for founding Éditions ...

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