#it's my birthday so naturally i must give all my beloved mutuals and followers a lil gift

[my-deer-friend]

Play along: Amrev codebreaker!

While browsing through some primary materials reading up about John Laurens’ mission to France as special minister to the court of Versailles, I came across a letter that he wrote to the president of the Continental Congress on 9 April 1781 that included a coded message using a numerical cipher. 

I took a shot at deciphering it – here’s the process I followed, and you can play along too!

1. The first step, of course, was to determine which specific encryption was being used. After a bit of digging, I came across the immensely useful United States diplomatic codes and ciphers, 1775-1938 by Ralph E Weber. He explains that the cipher in question was “prepared on separate encode and decode sheets, the latter contained 660 printed numbers, with usually 600 words, syllables, and letters of the alphabet scattered randomly throughout the sheet.” So, for example, the word “congress” is “143”, the syllable “el” is “593” and the letter “r” is “215”. This cipher was an updated and improved version of the one used by Benjamin Tallmadge, and Weber explains that Laurens was the first one to use it. Weber also handily provides the decode table in an appendix. 

2. The second step was to design an efficient way to decode the hundreds of numbers Laurens used in his letter, and the obvious answer was my good friend the spreadsheet. I transferred the table from the book to Google Sheets, which was mildly tedious but hugely time-saving later on.

3. Now the fun part! I typed out the numbers from Laurens’ letter, and then used a simple LOOKUP formula to match the number to the decoded text.

The cipher also includes two nuances - an underscore beneath the word means a plural, and an overscore denotes adding an “e” - so I marked these in the cells with pink and green highlights respectively.

4. The final step was correcting a few errors in my table, refining the decoding (some numbers have various iterations to save space, such as 103 which can be any one of “ec/eck/ek” depending on which syllable is needed), and extracting the final text. 

It all reads very smoothly, with the singular exception of “ght-f-t”, which is the way Laurens rendered the word “gift”. The obvious explanation for this mangle is that he mis-wrote 340 (ght) instead of 170 (gi).

That’s definitely 340, 304, 196 which decodes as “ght-f-t”.

While it seems like a strange error to make, bear in mind that the encoding sheet (the one Laurens was using to change plaintext into numbers) would have been listed in alphabetical order to make finding the numbers easier (while the person at the other end has the sheet in numerical order, to reverse the process just as easily). And when we sort alphabetically, we can see that 340 and 170 are right next to each other:

A simple slip to make for someone writing coded letters late at night in low candlelight.

If you want to play along:

Here’s the code/decode spreadsheet. 

And here is the transcribed text (underlines for plurals, asterisk for added “e”). I've given the solution under the cut!

I have employed the most unremitting efforts to obtain a prompt and favorable decision relative to the object of my mission_ 381, 304, 543, 437, 366, 377, 276, 75, 75, 226, 269, 385, 426, 377, 17, 465, 197, 481, 428, 593, 381, 355, 153, 278*, 428, 333, 70, 18, 405, 184, 226, 291, 197, 376, 524, 330, 446, 362, 449, 143 The Count de Vergennes communicated to me yesterday his most Christian Majesty's determination to guarantee 381, 59, 594, 18, 9, 205, 330, 497, 254, 401, 376, 503, 306, 503, 467, 428, 226, 236, 330, 278*, 245, 205, 506, 99, 376, 381, 381, 256, 184, 90, 340, 304, 196 ...and the value of the military effects which may be furnished from the Royal Arsenal, 418, 330, 497, 428, 197, 380, 377, 196, 376, 45, 278, 245, 205 I shall use my utmost endeavours to procure an immediate 467, 208, 491, 18, 278*, 9, 205, 45, 278, 42, 381, 230, 215, 355, 18, 237, 330, 497*, 215, 167, 290, 377, 376, 341, 278, 182, 302, 75, 376, 59, 594, and shall renew my solicitations for the 357, 34, 197, 18, 203, 291, 491, 481, 484, 34, 325, 89, 113, 392, 197, 269, 336, 458, 278*, 97, 18, 245, 205 may not be 126, 21, 215, 497, 376, 341, 296, 75, 477, 226, 103, 196, 481, 278*, 483, 215, 553, 75*, 18, 238, 377, 59, 374, 478, the providing this article I fear will be attended with great difficulties and delays as all the 476, 490, 481, 36, 228, 351, 392, 226, 197, 18, 237, are remote from the sea, and there are no 441, 420, 50, 563, 503, 197, 18, 377, 59, 278, suitable to our purposes. The cargo of the Marquis de la Fayette will I hope arrive safe under the convoy of the Alliance_ 481, 341, 78, 465, 75, 426, 408, 596, 115, 76, 376, 174, 196*, 291, 103, 197, 75, 75, 184, 226, 197, 281, 5, 171, 278*, 428, 593, 381, 355, 492, 194, 236, 376, 45, 574, 408, 504, 366, 381, 506, 197, 197, 193, 213, 75, 197, 199, 291, 377, 197 The Marquis de Castries has engaged to make immediate arrangements for the safe transportation of the pecuniary and the other succours destined for the United States_ 481, 350, 215, 167, 450, 196, 376, 34, 381, 75, 473, 376, 76*, 458, 278*, 72, 208, 449, 577, 114, 89, 405, 486, 497, 197, 113, 126, 34, 361, 376, 269, 278*, 277, 291, 104, 381, 113, 278*, 401, 230, 408, 550, 552, 342, 291

Have fun!

I have employed the most unremitting efforts to obtain a prompt and favorable decision relative to the object of my mission_ after many discussions, difficulties and delays with the details of which it is needless to trouble congress.

The Count de Vergennes communicated to me yesterday his most Christian Majesty's determination to guarantee a loan of ten millions to be opened in Holland in addition to the six millions granted as a gracious gift.

...and the value of the military effects which may be furnished from the Royal Arsenal are to be deducted from the six million.

I shall use my utmost endeavours to procure an immediate advance of the ten millions from the treasury of France to be replaced by the proposed loan,

and shall renew my solicitations for the supplies of the ordinance and military stores on credit that the present of six millions may not be absorbed by thousands objects and the purchase of necessary clothing

the providing this article I fear will be attended with great difficulties and delays as all the wool and manufactories of France are remote from the sea, and there are no

public magazines of cloth suitable to our purposes.

The cargo of the Marquis de la Fayette will I hope arrive safe under the convoy of the Alliance_ and by satisfying our immediate necessities prevent the delays above-mentioned from having any disagreeable consequences

The Marquis de Castries has engaged to make immediate arrangements for the safe transportation of the pecuniary and the other succours destined for the United States_ and has repeatedly assured me that the naval superiority which will be established on the American coast the ensuing campaign

#historical john laurens #john laurens #amrev #18th century history #code breaking #it's my birthday so naturally i must give all my beloved mutuals and followers a lil gift #let me know what results you got!!

[brodiehiggs5-blog]

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