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  2. Pigpen cipher - Wikipedia

    en.wikipedia.org/wiki/Pigpen_cipher

    The pigpen cipher uses graphical symbols assigned according to a key similar to the above diagram. [1]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.

  3. 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 .

  4. Missing square puzzle - Wikipedia

    en.wikipedia.org/wiki/Missing_square_puzzle

    The apparent triangles formed from the figures are 13 units wide and 5 units tall, so it appears that the area should be S = ⁠ 13×5 / 2 ⁠ = 32.5 units. However, the blue triangle has a ratio of 5:2 (=2.5), while the red triangle has the ratio 8:3 (≈2.667), so the apparent combined hypotenuse in each figure is actually bent.

  5. Kryptos - Wikipedia

    en.wikipedia.org/wiki/Kryptos

    The coordinates were part of the first clue of the second The Da Vinci Code WebQuests, with the first answer being Kryptos. The other reference is hidden in the brown "tear" artwork—the upside-down text "Only WW knows" is another reference to the second message on Kryptos .

  6. Four-square cipher - Wikipedia

    en.wikipedia.org/wiki/Four-square_cipher

    The four-square cipher uses four 5 by 5 (5x5) matrices arranged in a square. Each of the 5 by 5 matrices contains the letters of the alphabet (usually omitting "Q" or putting both "I" and "J" in the same location to reduce the alphabet to fit).

  7. Scytale - Wikipedia

    en.wikipedia.org/wiki/Scytale

    A scytale. In cryptography, a scytale (/ ˈ s k ɪ t əl iː /; also transliterated skytale, Ancient Greek: σκυτάλη skutálē "baton, cylinder", also σκύταλον skútalon) is a tool used to perform a transposition cipher, consisting of a cylinder with a strip of parchment wound around it on which is written a message.

  8. Secret Coders - Wikipedia

    en.wikipedia.org/wiki/Secret_Coders

    Secret Coders is a series of graphic novels that combines logic puzzles, basic programming instruction, and a story where a group of seventh graders uncover a secret coding school. The series is written by Gene Luen Yang , illustrated by Mike Holmes, and published by First Second Books .

  9. Beale ciphers - Wikipedia

    en.wikipedia.org/wiki/Beale_ciphers

    A pamphlet published in 1885, entitled The Beale Papers, is the source of this story.The treasure was said to have been obtained by an American named Thomas J. Beale in the early 1800s, from a mine to the north of Nuevo México (New Mexico), at that time in the Spanish province of Santa Fe de Nuevo México (an area that today would most likely be part of Colorado).