The other day, I reported George Lasry's solution of several syllabary ciphers, two of which employed vowel indicators. Right after that, I received solution of those two vowel indicator systems from Carlos Köpte, who independently solved them. He designed a program to solve ciphers that employ consistent vowel indicators.
Now, Carlos sent in his solution of another vowel indicator system used in a letter from Juan de Idiaquez Olazabal y Pedro Gonzalez de Mendoza to Philip II. As it turned out, the cipher is the same as a cipher used in other channels.
Now, the achievement is recorded in "Spanish Ciphers during the Reign of Philip II" and "Unsolved Historical Ciphers".
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