![]() For example, the hidden message may be in invisible ink between the visible lines of a private letter. Generally, the hidden messages appear to be (or to be part of) something else: images, articles, shopping lists, or some other cover text. The first recorded use of the term was in 1499 by Johannes Trithemius in his Steganographia, a treatise on cryptography and steganography, disguised as a book on magic. The word steganography comes from Greek steganographia, which combines the words steganós ( στεγανός), meaning "covered or concealed", and -graphia ( γραφή) meaning "writing". In computing/electronic contexts, a computer file, message, image, or video is concealed within another file, message, image, or video. Steganography ( / ˌ s t ɛ ɡ ə ˈ n ɒ ɡ r ə f i/ ( listen) STEG-ə- NOG-rə-fee) is the practice of representing information within another message or physical object, in such a manner that the presence of the information is not evident to human inspection. The same image viewed by white, blue, green, and red lights reveals different hidden numbers. For the prefix "Stego-" as used in taxonomy, see List of commonly used taxonomic affixes. ![]() ![]() For the process of writing in shorthand, see Stenography. ![]()
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