I uploaded a new article "A Cipher with Vowel Indicators Used by Papal Nuncio Castiglione (1527)"
The cipher, which I call the Castiglione-Schomberg Cipher, is used in letters deciphered by Marcello Simonetta and Norbert Biermann.
The cipher employs a scheme I call a vowel indicator system, whereby syllables are represented by a base symbol indicative of a consonat combined with an additional stroke or a superscript figure indicative of a vowel.
Castiglione was an apostolic nunctio (ambassador) sent by the Pope to Emperor Charles V in Spain, and Schomberg worked for the Pope in negotiation with the Imperialists. It is desired to establish whether this cipher was provided by the Vatican, because some of the other early vowel indicator systems appear to belong to the Imperialists. If the Castiglione-Schomberg Cipher was Vatican's, a new question arises how come the same scheme began to be used by both the Vatican and the Imperialists about the same time. I included some preliminary discussion on the matter.
I also mentioned this in "Tracing the Origin of Vowel Indicators in Spanish Ciphers".
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