![]() ![]() 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 concealing a message within another message or a physical object. The same image viewed by white, blue, green, and red lights reveals different hidden numbers. ![]()
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