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  2. Paper fortune teller - Wikipedia

    en.wikipedia.org/wiki/Paper_fortune_teller

    The person operating the fortune teller manipulates the device based on the choices made by the player, and finally one of the hidden messages is revealed. These messages may purport to answer questions (hence the name), or they may be activities that the player must perform. The same shape may also be used as pincers or as a salt cellar.

  3. Hidden message - Wikipedia

    en.wikipedia.org/wiki/Hidden_message

    Hidden messages include backwards audio messages, hidden visual messages and symbolic or cryptic codes such as a crossword or cipher. Although there are many legitimate examples of hidden messages created with techniques such as backmasking and steganography , many so-called hidden messages are merely fanciful imaginings or apophany .

  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 ...

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  6. List of steganography techniques - Wikipedia

    en.wikipedia.org/wiki/List_of_steganography...

    Hidden messages distributed, according to a certain rule or key, as smaller parts (e.g. words or letters) among other words of a less suspicious cover text. This particular form of steganography is called a null cipher. Messages written in Morse code on yarn and then knitted into a piece of clothing worn by a courier. [1]

  7. Invisible ink - Wikipedia

    en.wikipedia.org/wiki/Invisible_ink

    Pens are now also available that can be erased simply by swiping a special pen over the original text. Disappearing inks have been used in gag squirtguns, for limited-time secret messages, for security reasons on non-reusable passes, for fraudulent purposes, and for dress-making and other crafts where measurement marks are required to disappear.