A letter with a ciphered paragraph from Charles V to Prince Philip (1545) is presented on Spanish
Ministry of Culture's website (
pdf) and
PARES' facebook page. The cipher turned out to be the same as the one broken by George Lasry and Carlos Köpte independently in 2023. So, I promoted the cipher as "Charles V-Prince Philip Cipher (1545)" in
"Ciphers during the Reign of Emperor Charles V".
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