George Lasry’s decipherment
George Lasry’s report on this item, as he sent it on 24 October 2026 (PDF), in its own order and wording. The decipherment, the translation and the reconstruction of the key are his, made with ChatGPT Astra 6 and Anthropic Opus 5.5. This project’s own checks follow under Verification.
Français 3321
Contents: A political letter says the union can impose its terms and describes an escape from execution, drowning and plunder; several named opponents remain uncertain.
Transcribed; Deciphered
- Ciphertext-only:
- No
- Sender:
- Signed DC
- Recipient:
- Not established
- Year:
- 20 May; year not established
- Key:
- 32 symbols, 25 letter signs, 5 in nomenclature, 1 null ?, 1 unidentified
- Ciphertext:
- 49 elements, 46 identified (93.9%); 2 ?, 1 unidentified
- Interlinear plaintext:
- Interlinear plaintext on the same page, f103r. ·
Excerpt and Translation
f103r, first four lines
Excerpt
Les affaires sont en tel termes qu'infalliblement la Ruyne de Espernon s'en ensuivra, ou de cest estat. Car l'union est si forte qu'elle peult mieux donner la loy que la recepvoir. Demain la req[ueste] s'en doibt partir, vous en aurez Incontinent la coppie Comme on vous envoye du reste.
Translation
Affairs have reached such a point that Épernon’s ruin, or the ruin of this state, will inevitably follow. The union is so strong that it can dictate the law rather than receive it. The petition is to be sent tomorrow; you will immediately receive a copy, as the other material is being sent to you.
Readable text
The full text, folio by folio, as in the report. Bold marks the passages deciphered from the cipher; the rest is the clear text of the letter. Question marks are the report’s: [?] or a bare ? for a sign or group left unread, a ? after a word for a doubtful reading.
Français 3321 — f103r
Les affaires sont en tel termes qu'infalliblement la Ruyne de Espernon s'en
ensuivra, ou de cest estat. Car l'union est si forte qu'elle peult mieux
donner la loy que la recepvoir. Demain la req[ueste] s'en doibt partir,
vous en aurez Incontinent la coppie Comme on vous envoye du reste,
Tous les gens de bien s'offrent a la maintenir et Ceulx mesmes dont vous
doubteriez le moins. Aussy est elle plaine de Justice et qui Justiffie
les actions de ses princes, C’est a vous a resouldre ce que vous
voullez devenir, sy le tout se termine sans vous on ne vous en aura
aulcun gré et s'il ? en longueur vous ne serez excusable
envers dieu ny vostre patrie ? vous en escript. Je vous supplie de luy
respondre clairement. Du Laurens a veu a l'oeil tout ce qui s'est
passé par dela et Comme on a Joué à ung Coupt de dé l'estat de ceste
ville. Les autheurs de ce beau Conseil sont d'O? et la Guysche, suscit
ez par Navarre. Dieu seul nous a sauvez de la Corde, de l'eaue et du sac
ou nous estions destinez sans aulcune preuve ny forme de Justice,
Il nous fera la grace de nous conserver, C’est ce que Je vous en puis
dire pour vous baiser treshumblement les mains. Ce xxme may.
Il vous plaira me faire responce sur l'estat
que Je vous ay envoyé.
DC?
At a glanceKey from adjacent plaintext · partial (89% of the cipher)
- The letter
- A letter signed DC, dated 20 May with the year not established (the League context suggests 1588), warning of Espernon’s ruin or the state’s.
- Where
- Bibliothèque nationale de France, Français 3321, f103r (Gallica
btv1b9060212v). - The cipher
- 32 symbols: 25 letter signs, 5 nomenclature, 1 null and 1 unidentified; only 49 cipher elements.
- How it was read
- Lasry recovered the key from the interlinear plaintext on the same page. The spot-check read l’union est si fort and the Espernon code.
- What it says
- Affairs are such that Espernon’s ruin or the state’s will follow; the union is strong enough to dictate the law, and the petition goes tomorrow.
- Still open
- 93.9% of elements are identified, below the usual bar.
- Credit
- George Lasry, with ChatGPT Astra 6 and Anthropic Opus 5.5 (BnF cipher research, 10 October 2026). This project only spot-checked one sample against the image.
01 Verification
Spot-check against the manuscript
This result is George Lasry’s. This project did not re-solve the cipher: it checked one sample against the Gallica image and recorded what it found.
- Batch B. Image checked: https://openapi.bnf.fr/iiif/image/v3/ark:/12148/btv1b9060212v/f105/full/1600,/0/default.jpg
- Folio matches the report: yes; cipher present: yes
- What we checked: f103r l.2 after "Car": l u n i o n [est] s i f o r t (14 signs incl. est code) = "lunion est si fort"; also Espernon code after "Ruyne de"; matches excerpt and interlinear
- Verdict: confirmed (method key recovered based on adjacent plaintext, extent partial). The check is a sample, not a re-solution.
- Notes: Only 49 cipher elements; 93.9% identified (<95%). Signed with monogram, "xxme may". Ligue context (union vs Epernon) suggests 1588.
02 Other contributions
The plaintext of the period beside the cipher, as George Lasry reports it:
- Interlinear plaintext
- Interlinear plaintext on the same page, f103r.
Full texts
The transcription and the decryption of every document on this page, so that the reading can be used and checked. Short files are shown here; all are in the repository.
George Lasry's report entry (excerpts and translation) read in part
A political letter says the union can impose its terms and describes an escape from execution, drowning and plunder; several named opponents remain uncertain. Signed DC, 20 May, year and recipient not established (the League against Epernon suggests 1588), as given in George Lasry's report and our spot-check.
Builds coherent sentences, but under the read bar of 95% of words read as sense (100% here); the holes are marked in the reading.
Decryption: in full above, in George Lasry’s decipherment (readable.md)
Reading: in full above, in George Lasry’s decipherment (readable.md)
Translation: in full above, in George Lasry’s decipherment (translation_excerpt.md)
03 Sources
- George Lasry, with ChatGPT Astra 6 and Anthropic Opus 5.5, BnF cipher research, 10 October 2026 (sent to Daniel Bourdeau on 13 October 2026 for publication here), p. 80; his other items are listed on his contributor card.
- image checked in the spot-check
- The working folder:
targets/fr3321dc/(his entry as extracted from the report, our spot-check,profile.json).