Annie
Not So Junior Member
http://online.wsj.com/article/SB124648494429082661.html?mod=yhoofront
Two Centuries On, a Cryptologist Cracks a Presidential Code
Unlocking This Cipher Wasn't Self-Evident; Algorithms and Educated Guesses
By RACHEL EMMA SILVERMAN
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....