Story
I'll just pull out 2 paragraphs:
LANGLEY, Va. -- The big mystery at the Central Intelligence Agency, sitting in a sunny corner of the headquarters courtyard, begins this way: "EMUFPHZLRFAXYUSDJKZLDKRNSHGNFIVJ."
That's the first line of the Kryptos sculpture, a 10-foot-tall, S-shaped copper scroll perforated with 3-inch-high letters spelling out words in code. Completed 15 years ago, Kryptos, which is Greek for "hidden," at first attracted interest mainly from government code breakers who quietly deciphered the easier parts without announcing their findings publicly.
Efforts at finding a solution have grown increasingly elaborate. Elonka Dunin, an executive at St. Louis computer-game company Simutronics, has hunted down other encoded sculptures by Mr. Sanborn in search of recurring themes. Some, like researcher Chris Hanson, who runs a company that makes software for constructing 3D landscape models, have mapped the CIA's headquarters or built virtual replicas of Kryptos.