Solving the Enigma of Kryptos
`What does it say about the Central Intelligence Agency that its agents can crack the secret codes of enemy nations but can’t unravel a coded sculpture sitting outside their cafeteria window? [..]
It’s been nearly 15 years since Sanborn installed the 12-foot-high, verdigrised copper, granite and wood sculpture inscribed with four encrypted messages at the CIA’s Langley, Virginia, headquarters in 1990. And it’s been seven years since anyone made progress at cracking its code.’
