Syllabical and Steganographical Table
Eighteenth-century work believed to be the first cryptography chart From Wikipedia, the free encyclopedia
Syllabical and Steganographical Table (French: Tableau syllabique et stéganographique) is an eighteenth-century cryptographical work by P. R. Wouves. Published by Benjamin Franklin Bache in 1797, it provided a method for representing pairs of letters by numbers. It may have been the first chart for cryptographic purposes to have been printed in the United States.[1][2]
References
Wikiwand - on
Seamless Wikipedia browsing. On steroids.