Steganographia is the practice of concealing messages within other non-secret text or data to avoid detection. The term is often associated with the specific art and craft of hidden communications, where information is embedded in a way that makes it difficult for an observer to realize that a message is present. Historically, the term "Steganographia" was popularized by Johannes Trithemius, a 15th-century monk, who wrote a book of the same name.
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