I made addtions for more ciphers related to Charles V in a new section "Contributions since September 2026" here and also updated the section "Three Ciphers between Adrian of Utrecht and Charles V (1520-1523)". They are works by Daniel Bourdeau, Brice Dudout, Lawrence Beck, Prabal Gupta, and Ivan Sourvillo.
This shows that Lope Hurtado de Mendoza used a simple homophonic cipher in December 1520 (when Charles V was in Worms), but used in 1522 a Spanish-style cipher with a nomenclature in three-letter code groups.
For Adrian of Utrecht, a similar transition occurred between July 1520 and September 1520.
It would be interesting to know how key agreement was achieved. It might explain the difference in timing, between these channels, of switching from simple Flemish ciphers to Spanish-style ciphers.
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