F x 5 d 3 y w M & # 7 q 4 n 9 8 3 M p l 4 x @ v 4 x L m 7 p· s a l u t e m et o m n e b o n u m i l l u s t r i s s i m iw = e · x = s · 3 = u · v = r · y = t · q = n · 5 = a · 2o = et/und

Buda → Munich · homophonic cipher of graphic signs · February 1534

King John of Hungary and an agent at Buda to the dukes of Bavaria, February 1534

John Zápolya
fromJohn Zápolya
Wilhelm IV, Duke of Bavaria
toWilhelm IV, Duke of Bavaria

Bayerisches Hauptstaatsarchiv, Kurbayern Äußeres Archiv 4591, ff. 248 and 250–251 (DECODE R9411, R9412; catalogue 163). DECODE lists both as letters of Cornelio Sperantio to an unknown recipient. They are letters to the dukes of Bavaria, sent under cover to Sperantio.

The key was recovered from adjacent plaintext: the Latin letter carries a contemporary interlinear decipherment over every line, which was transcribed and checked (96% of words). Applied to the German letter, which has no decipherment, the key gives 95% of its words, 89% without editorial supplies. It is the key recovered earlier here for R9415 in the same volume. Neither letter was found in print.

Daniel Bourdeau · posted · updated

Method: key recovered based on adjacent plaintext · Extent: partial (92% of the cipher)

Summary. The catalogue entry was two DECODE records, “Cornelio Sperantio to …”, partially decrypted, 5 pages, in a volume of Bavarian cipher keys. The cover on f. 251v reads “Cornelio Sperantio etc. domino observandissimo”: Sperantio, the dukes’ man at Buda, received the packet. R9411 is a Latin letter of King John Zápolya to the dukes of Bavaria, Buda, 6 February 1534, about the Hungarian gold and silver mines and his servant Nicolaus Freiberger. It has an interlinear decipherment of the time over every line; the key was fixed from it by a solver (simulated annealing) held to the gloss values, and 96% of the letter’s words are deciphered. The same key, refitted for German, deciphers 95% of the words of R9412, a newsletter from Buda of 8 February 1534 on Stephan Werbőczy’s embassy to the Porte and the everlasting peace with the Turk (89% counting only what the cipher yields, without the editorial supplies). The key agrees sign for sign with the one rebuilt in this project for R9415, King John’s side to the dukes in April 1533, so the Sperantio file and R9415 are one correspondence. Two sessions worked the target independently on the same day and are merged here. What stays open is illegible: blotted signs and five names in R9412, thirteen short gaps in R9411.

01 The documents and the key

RecordFoliosDateLanguageWhat it isState
R9411248r–vBuda, 6 Feb 1534LatinKing John (Zápolya) of Hungary to the dukes of Bavaria; interlinear decipherment of the timeread, 96% of words
R9412250r–251r, cover 251vOfen (Buda), 8 Feb [1534]German, Latin passages in clearan agent at Buda to a duke of Bavaria, under cover to Cornelio Sperantioread in part, 95.0% (89% without supplies)

The cipher is a homophonic substitution on the graphic sign set of the volume (↓ ω π 4 8 ÿ …), written without word division, with clear Latin passages left standing in the cipher (“Ceterum”, “Misimus nunc”, “Et primo” … “Quarto”). Main values: w/4 e, q n, v r, x/L s, 5 a, 3 u, y t, 7 m, m i, c c, 9 o, d l, 6 d, 8 n, D f, A b, K rr, Y ll. A few signs are polyphonic (π b/w/o, 4 e/i, ∃ d/ch, a double stem for u/v/k/g), and a few stand for pairs or words: 2o = et in Latin and und in German, oo = qu, r+ = sch, a+ = der. A ‡ before a double colon is a paragraph null.

Checked against the key rebuilt in kaa4591b for R9415 (18 April 1533), the common signs all agree (w e, x s, 3 u, v r, y t, q n, 5 a, 7 m, 9 o, 8 n, d l, 6 d, D f, c c). One session found the key from R9411’s gloss; the other applied the R9415 key unchanged, without the gloss, and reached 91% on R9411. The two routes confirm each other.

02 R9411: King John to the dukes, Buda, 6 February 1534

From the decipherment (sperantio1534/r9411/reading_r9411.txt), in the original Latin, with gaps as […]:

Salutem et omne bonum. Illustrissimi principes domini ac fratres carissimi. Accepimus literas Vestre et ea quae […] etiam intelleximus quae […] secretarium suum scripserunt. Vestre ita sibi persuadere velint, quidquid nos in rem commodum et dignitatem earum et fratrum atque amicorum suorum id facere possumus, id semper libentissimo animo facturi sumus. […] videtur tamen esse res communicanda cum illustri domino regni nostri gubernatore, qui propediem hic apud nos futurus est. Videtur enim nobis esse satius de hac re capere consilium ipsius quam si ex abrupto apud potentissimum Turcarum imperatorem rem tentaremus. … Ceterum Vestre medio magnifici […] capitanei et consiliarii nostri … ex parte minerarum auri, argenti et aliorum metallorum, quae res nobis vehementissime fuit cordi, … cum Dei auxilio rem aggredi. … Misimus nunc hunc servitorem nostrum Nicolaum Freeberger ad Vestras … Bude sexta Februarii, anno etc. xxxiiii.

In English: King John will do whatever he can for the dukes, whom he addresses as brothers. Their request must first go to the governor of his realm (Lodovico Gritti), who is expected shortly: better to take his counsel than to try the matter abruptly with the Turkish emperor. The news his adversaries spread is false. Through his captain and councillor he has begun on the gold, silver and other mines, a matter very close to his heart. He sends his servant Nicolaus Freiberger to the dukes, invites them to take on the working of such mines, and asks for masters skilled in them. A postscript asks for the Bavarian mining ordinance (“ordinacionem rerum montanarum”) by a sure messenger.

03 R9412: a newsletter from Buda, 8 February 1534

German, no gloss. It opens by repeating what the writer sent on 22 December by an unsure messenger. That date, in line 1, belongs to the earlier letter; this one is dated at its foot, “Datum Ofen, des achten Februarii”. From the decipherment (sperantio1534/r9411/reading_r9412.txt; […] not deciphered, braces supplied from sense, capitals in clear on the page):

wie erstlich, was der canczler herr Stephan Werbeczi bei dem Turcken hab ausgericht. ET PRIMO: so hat er dem Ungerland mit dem Turcken einen ewigen frid gemacht und angestossen. SECUNDO: das alle stett und flecken … als nemlich Peterwardein und […], mit Titil, Salmaulack {Salankamen} … TERTIO: … die zwitrachten, als von wegen des titels der kunig … QUARTO: … SED TAMEN PER MAXIMOS SUOS CONATUS NIHIL ALIUD IMPETRARE POTUIT QUAM ILLUD QUOD …

The chancellor Stephan Werbőczy has obtained at the Porte an everlasting peace between Hungary and the Turk. The Danube places are named: Peterwardein (Petrovaradin), Titel, Salankamen. The dispute over the kings’ titles and the frontier towns is to be settled, and the writer has sent a copy of the Sultan’s letter. Then come plans against Transylvania and the mines. Fridrich Schmalcz has made himself head of the mining business and sends men skilled in mining to Pest; his factor at Nuremberg is named, and “herr Caesar” at Vienna. A bishop sends the duke his greetings in clear Latin. The b/w and d/t pairs share signs, so “beczi” is Werbeczi.

04 Method

05 What remains uncertain

06 Sources

Transcriptions, key, decipherments and the working files of both sessions: sperantio1534/ in the repository.