Trithemius, Bellaso, Vigenère – Origins of the Polyalphabetic Ciphers
Paolo Bonavoglia · Linköping electronic conference proceedings · 2020
The purpose of this paper is to show how polyalphabetic ciphers developed, using primary sources, from Trithemius and Bellaso to Vigenère, including the recent discovery of the Bellaso 1552 zero cipher.