fromwww.scientificamerican.com
3 days agoHow the CIA's Kryptos Sculpture Gave Up Its Final Secret
The 35-year-old saga of Kryptos, an enigmatic sculpture containing four encrypted messages outside the CIA headquarters, just took a bizarre twist. Though cryptographers broke the first three passages in the 1990s, just a few years after artist Jim Sanborn erected the copper monolith, the fourth, known as K4, remained a 97-character fortressthat is, until September 2, when journalists Jarett Kobek and Richard Byrne discovered the answer in the Smithsonian archives.
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