There is an undeciphered letter from Le Tellier to Marquis de Castelnau, dated 12 May 1657, for which I added an entry in "Unsolved Historical Ciphers". Below is my transcription. For a bit more information as well as Le Tellier's other ciphers, see the section "Le Tellier-Castelnau Cipher" in "Ciphers Early in the Reign of Louis XIV".
This may be a bit too short for cryptanalysis, but if the assignment of numbers is regular as in some of Le Tellier's other ciphers, there may be some chance. If someone succeed in solving this, I'd be eager to know.
Jay eu commandement de vous adresser la despesche du Roy qui sera cy jointe pour vous faire congoistre ses instructions sur la marches que Sa Ma.te desire que vous fassiez avec les troupes estans au rendezvous de Rheimes et de Laon et de vous faire parent ces lignes que le dessein de Sa Ma.te estant 71 49 q ~4 57 3 ~34 q= "13 ~20 ~34 q ~3 a c 15 "12 ~13 ~9 4 & ~13 ~20 h- ss 16 47 56 13 ~14 14 ~30 l 3 rp 33 ~14 p 51 ap ~28 ~10 8 "34 ~3 4 18 ~30 19 ~18 15 ~23 "48 p ~53 J- x- ~3 "13 18 ~28 ~33 h- y- ~28 12 ~8 20 ~33 "17 51 20 f ~27 ~23 "33 ~28 z- ~4 c 31 "32 ~7 3 l 62 "12 ~35 13 ~38 ~23 "33 49 ~14 c 9 66 5~ 20 ~34 h ~37 t 5 p- ~30 l 14 ff 33 ~22 20 7 m- ~2 42 15 50 61 6 ~12 19 16 35 ~22 8 "25 ~38 J- o 15 ~23 "40 ~17 13 ~2 ~7 14 l 62 ~24 a p ap- 13 f ~28 47 51 h- ~28 ~3 20 14 49 ~13 2 ~7 ~4 h 20 47 m ~27 ap ss f ~28 "24 ~30 l 13 oo 33 "33 q= "14 51 ~34 h 31 m ~30 ap ~28 ~23 ~2 "32 "13 "24 ~4 & ~3 13 69 t t f ~28 ~42 ~53 72
I thank Alexandre Pillon for the information about this. Another unsolved ciphertext he provided before is also awaiting solution (Adam Starhemberg (1758)).
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