Two Centuries On, a Cryptologist Cracks a Presidential Code - WSJ.com
Interesting, though the codebreaker did use a computer to solve it.
200 anos depois um texto criptografado é decodificado.
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A cipher by Mr. Patterson. Simple to use without a computer, hard to crack.
For more than 200 years, buried deep within Thomas Jefferson's correspondence and papers, there lay a mysterious cipher -- a coded message that appears to have remained unsolved. Until now.