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Cryptography--Early works to 1800, Ciphers--Early works to 1800 Codices, Illuminations (visual works), Manuals (instructional materials), Treatises, Manuscripts Latin--15th century, Manuscripts Italian--15th century, Manuscripts Renaissance
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Porter, Dot, "Facsimile of LJS 225, Litterarum simulationis liber" (2015). Schoenberg Institute for Manuscript Studies (SIMS): EBooks. 178.
Presentation copy for Pope Callistus III of a work on cryptography that describes two systems: in the first, Italian words beginning with one letter are all represented by Italian words beginning with another letter; in the second, signs or symbols represent letters or entire Italian words (titles, city names, and numbers).