A letter from John Armstrong in Paris to Secretary of State James Madison, dated 20 February 1808, remains to be solved. I learned of this from Ms. Angela Kreider, the current editor of the Papers of James Madison at the University of Virginia, who seeks help from the cryptographic community.
Many letters from Armstrong to Madison can be solved with a key reconstructed from decoded materials, but this one is in a different code.
If someone succeeds in solving this, please let me know or contact the editor.
See my new article "An Outlier Code in Armstrong-Madison Correspondence (1808)" for details.
Comments are also welcome. For example, I'd appreciate if someone can tell whether the graphic symbols occurring here and there in the sequence of numbers are a shorthand or a substitution cipher.
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