Steganographia
15th-century book
Steganographia
Steganographia is a book on steganography, written in c. 1499 by the German Benedictine abbot and polymath Johannes Trithemius.
Read on Wikipedia · Image Trithemius, Johannes. Steganographia. Frankfurt: Johannes Saurius?, 1606. Digitized photographic reproduction., Public domain
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