How 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 fortress—that is, until September…
