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These ingredients were used to make oak gall ink. [5] People soon discovered that they could write invisibly with one of the ingredients and then cause the writing to appear by adding the other. [6] Pliny the Elder and the Roman poet Ovid gave advice on the use of plant juices and milk to write secret messages. [7]
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]
Another type of concealment is the hiding of messages in the text or on a book's pages by printing in code – a form of steganography. For example, letters could be underlined on sequential pages, with the letters spelling out a message or code. There are a number of actual and fictional examples of items or messages having been concealed in a ...
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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 .
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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. [4] [32] Kryptos was also featured in another of Dan Brown's novels, The Lost Symbol (2009). [2] A small version of Kryptos appears in the season 5 episode of Alias "S.O.S.".
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