Polygraphia_(book)
Polygraphia (book)
1518 book by Johannes Trithemius about steganography
Polygraphia is a cryptographic work written by Johannes Trithemius published in 1518 dedicated to the art of steganography.[1]
The full title is "Polygraphiae libri sex, Ioannis Trithemii abbatis Peapolitani, quondam Spanheimensis, ad Maximilianum Caesarem." ("Six books of polygraphy, by Johannes Trithemius, abbot at Würzburg, formerly at Spanheim, for the Emperor Maximilian.")
It is the oldest known source of the popular Witches' Alphabet, used at large by modern traditions of witchcraft.[2]