It is well-known that mathematician Charles Babbage solved a cipher in a letter from Henrietta-Maria to Charles I, but it is less known that he received materials on the ciphers used by the royal couple from historian Everett Green. While it appears true that he achieved his solution independently, there is evidence that the summary of the ciphers in his papers was taken from Green's work.
I uploaded a new article about this: "Charles Babbage Inquires Historian Everett Green"
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