Three ciphers used in letters to/from Charles V remain unsolved ("Unsolved Historical Ciphers"):
- Letter from Emperor Charles V (1521?): BnF Clair. 322, f.105v (Gallica)
- A Report to Charles V (1527?): BnF fr.3022, f.16 (Gallica)
- Marquis of Gasto to Charles V (1527). ff.26-28, 39, 40-43 (Gallica)
When I came to know 17 ciphers reconstructed by Olga Kolosova from letters to Charles V in 1521-1527 ("Scholarly Studies on Ciphers in the Reign of Emperor Charles V"), I was thrilled because the scope exactly matched these unsolved ciphers. But I couldn't find a mathing cipher among her reconstructions. It may well have been that the three ciphers are simply not among the 17 reconstructions, but I have to admit my search was not thorough. I simply looked for a couple of symbols in each cipher (e.g., "3" with an additional stroke below in BnF fr.3022, f.16; "s", "3", "v" with two additional lines in BnF fr.3022, f.26). Although this worked for Mary-Grange Cipher (1571) (see here), there's some chance that I simply overlooked this time. If someone finds a match, please let me know.
f.12 (no.5) Perez to Charles V, Rome, 24 September 1527 (the same cipher as in BnF Clair.326): George Lasry solved this. I also found it matched a cipher I reconstructed. The cipher corresponds to one of Kolosova's reconstructions (Ko.1).
f.16-f.17 (no.6) Report to Charles V, unsolved (see above).
f.20 (loose sheet) The same cipher as f.12.
f.26-28 (no.10) Marquese del Gasto to Charles V, Ysola, 27 September 1527, unsolved (see above).
f.39 Belong to the following?
f.40 Marquese del Gasto to Charles V, Rome, 6 November 1527, unsolved (see above).
f.44 Memoire in Italian, Madrid, 11 April 1528, unsolved (see here). The symbols with superscript figures look like those in Lu.6 (used by Andrea Doria and Charles V in 1537) reconstructed by Luo (2021) but the range of figures does not match at all.
f.48 Jargon in Italian (ibid.)
f.50 "Aditione del zifra" (ibid.)
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